I tried to answer write a code to solve this problem, but I'm still getting a wrong answer at test 15 and I don't know what is missing in my code.
I tried a lot of test cases but the code has solved them all correctly.
My Code :
#include <iostream>
#include <map>
#include <vector>
using namespace std;
int main()
{
int c; cin >> c;
int v; cin >> v;
if (c == 1 && v == 0)
{
cout << 1 << " " << 1;
}
else
{
int cArray[c + 1];
int voting[v][c];
for (int j = 0; j<v; j++)
{
for (int z = 0; z<c; z++)
{
int temp; cin >> temp;
voting[j][z] = temp;
}
}
for (int j = 0; j <= c; j++)cArray[j] = 0;
for (int j = 0; j<v; j++)cArray[voting[j][0]]++;
int maxim = 0;
int maxN = 0;
int count = 0;
map<int, int > cand;
for (int j = 1; j <= c; j++)
{
if (cArray[j]>maxN)
{
cand.clear();
cand[j] = 1;
maxN = cArray[j];
maxim = j;
count = 0;
}
else if (cArray[j] == maxN)
{
cand[j] = 1;
count++;
}
}
if (count == 0)
cout << maxim << " " << 1;
else
{
for (int j = 0; j<v; j++)
{
for (int z = 1; z<c; z++)
{
if (cand.count(voting[j][z]))
{
cArray[voting[j][z]]++;
break;
}
}
}
maxim = 0;
maxN = 0;
count = 0;
for (int j = 1; j <= c; j++)
{
if (cArray[j]>maxN)
{
maxN = cArray[j];
maxim = j;
count = 0;
}
else if (cArray[j] == maxN)
{
count++;
}
}
cout << maxim << " " << 2;
}
}
return 0;
}
Your algorithm for checking the first round (win or top two candidates) seems wrong. It looks like you are expecting the top two candidates to have the same number of primary votes - this is not the case. You want to pick the top two candidates and the top one wins if it has more than 50 % of the vote.
I don't want to give you the answer (as that is the point of doing the exercises), but you need to rethink how you are processing the first part of the vote.
Also note that once someone has voted for one of the top two candidates, their secondary votes should not then count toward the other candidate (which you are currently doing).
Related
#include<iostream>
using namespace std;
int main(){
int n=5;
int i = 2;
for (i; i <= n; i++)
// for all num to n
{
int j = 2;
bool divide = false;
for (j; j <= n - 1; j++)
// for checking each num
{
if (i % j == 0)
{
divide = true;
break;
}
}
if (divide == false)
{
cout << i << " ";
}
}
return 0;
}
my Q is that
//please tell me why it is not working
//it is expected to give ans 2,3,5 which it is not giving why???
maybe I found the issue.
I think that the problem here is:
for (j; j <= n - 1; j++)
Here you did j<=n-1;
So to fix this just do:
for(j; j < i; j++){
//this should fix
So everything should look like this:
#include<iostream>
using namespace std;
int main() {
int n = 5;
int i = 2;
//check prime numbers starting from i and max n using for loop
for (i = 2; i <= n; i++) {
bool divide = false;
for (int j = 2; j < i; j++) {
if (i % j == 0) {
divide = true;
break;
}
}
if (!divide) {
//!divide is equal to divide=false
cout << i << " ";
}
}
}
I did the same question a while ago, but It got closed. I'll try to express myself better this time.
I want to make an algorithm that can solve a sudoku puzzle, looks like It is working, but in the backtracking part(where I need to go back to a previous recursion to test a different value), It doesn't, showing a "segment fault" error.
Also, I use "0" as a blank space, so that's why "if (!board[i][j]) //do something"
// Solves the game
vector<vector<int>> sudokuSolver(vector<vector<int>> board) {
if (isFull(board)) {
return board;
}
bool found = false;
int line = 0;
int col = 0;
for (int i = 0; i <= 8; i++) {
for (int j = 0; j <= 8; j++) {
if (!board[i][j]) {
line = i;
col = j;
found = true;
break;
}
}
if (found) break;
}
vector<int> possibleNumbers = possibilities(board, line, col);
cout << '\n';
printBoard(board);
cout << '\n';
cout << line << ' ' << col << '\n';
cout << '\n';
printVector(possibleNumbers);
int size = possibleNumbers.size();
for (int k = 0; k < size; k++) {
board[line][col] = possibleNumbers[k];
cout << k << '\n';
sudokuSolver(board);
// the code doesn't pass to the next cout. Why?
cout << "it doesn't reach here :/" << '\n';
}
cout << "backtracking!!" << '\n';
board[line][col] = 0;
cout << "agora:" << '\n';
printBoard(board);
}
I put some "couts" to help me visualize the problem. The "backtracking!!" cout is working properly, but the "it doesn't reach here" cout is not. I thought that, after the code realize It doesn't have possible solutions, It would simply go back to the last recursion, but It's not, giving "segmento fault" error. I don't understand
for (int k = 0; k < size; k++) {
board[line][col] = possibleNumbers[k];
cout << k << '\n';
sudokuSolver(board);
// the code doesn't pass to the next cout. Why?
cout << "it doesn't reach here :/" << '\n';
}
Am I not getting something?
Also, if It's not clear, "isFull" checks if the board is full (base case, game is complete), and possibilities checks the number possibilities of a single cell
Thanks in advance. I guess the details are way better this time, hope I did It right
Edit: The extra couts are ways of showing me where the code is. They are not important for the algorithm itself
Final edit: I did it! Thanks you all. For anyone who wants the full code, here it is:
#include <bits/stdc++.h>
using namespace std;
bool gameRunning = true;
void printBoard(vector<vector<int>> board) {
for (int i = 0; i <= 8; i++) {
for (int j = 0; j <= 8; j++) {
cout << board[i][j] << ' ';
}
cout << '\n';
}
cout << '\n';
}
void printVector(vector<int> v) {
for (auto x : v) {
cout << x << ' ';
}
cout << '\n';
cout << '\n';
}
// Checks if the board is full, deciding if the game is already won
bool isFull(vector<vector<int>> board) {
for (int i = 0; i <= 8; i++) {
for (int j = 0; j <= 8; j++) {
if (!board[i][j]) return false;
}
}
return true;
}
// Generates all number possibilites for a given cell on the board
vector<int> possibilities(vector<vector<int>> board, int i, int j) {
bitset<9> p;
for (int i = 1; i <= 9; i++) {
p[i] = 1;
}
//horizontal check
for (int col = 0; col <= 8; col++) {
if (board[i][col]) {
p[board[i][col]] = 0;
}
}
//vertical check
for (int line = 0; line <= 8; line++) {
if (board[line][j]) {
p[board[line][j]] = 0;
}
}
//mini-square check
int linesquare = (i / 3) * 3;
int colsquare = (j / 3) * 3;
for (int l = linesquare; l <= linesquare + 2; l++) {
for (int c = colsquare; c <= colsquare + 2; c++) {
if (board[l][c]) {
p[board[l][c]] = 0;
}
}
}
vector<int> numberPossibilities;
for (int k = 1; k <= 9; k++) {
if (p[k]) numberPossibilities.push_back(k);
}
return numberPossibilities;
}
// Solves the game
void sudokuSolver(vector<vector<int>> board) {
if (isFull(board)) {
printBoard(board);
gameRunning = false;
}
if (gameRunning) {
bool found = false;
int line = 0;
int col = 0;
for (int i = 0; i <= 8; i++) {
for (int j = 0; j <= 8; j++) {
if (!board[i][j]) {
line = i;
col = j;
found = true;
break;
}
}
if (found) break;
}
vector<int> possibleNumbers = possibilities(board, line, col);
int size = possibleNumbers.size();
for (int k = 0; k < size; k++) {
board[line][col] = possibleNumbers[k];
sudokuSolver(board);
}
board[line][col] = 0;
}
}
int main() {
/*
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
*/
vector<vector<int>> v;
for (int i = 0; i < 9; i++) {
vector<int> hold;
for (int j = 0; j < 9; j++) {
int a;
cin >> a;
hold.push_back(a);
}
v.push_back(hold);
}
cout << '\n';
sudokuSolver(v);
return 0;
}
Bye, have a great day
I know this might be a duplicate to another question on this forum but I couldn't find the solution for my problem, even if I searched for like 1 hour.
The problem is that my program stops after the 4th "cin". I don't know why, I tried everything: "cin.ingore(); cin.clear();", "cin.get();".
Could someone help me please?
#include <iostream>
#include <vector>
#include <iomanip>
using namespace std;
struct elev
{
char nume[20];
vector<int> note_info;
float medie;
};
int main()
{
int n, e = 0;
vector<elev> elevi;
cout << "n = "; cin >> n;
for (int i = 1; i <= n; i++)
{
int s = 0, nr;
elevi.push_back(elev());
cout << "Nume elev: "; cin >> elevi[i].nume;
cout << "Numar note informatica: "; cin >> nr;
for (int j = 0; j < nr; j++)
{
int temp;
cout << "Nota nr. " << j + 1 << ": "; cin >> temp;
elevi[i].note_info.push_back(temp);
s += temp;
}
elevi[i].medie = (float)(s / nr);
}
for (int i = 1; i <= n; i++)
{
for (int j = i; j <= n; j++)
{
if (elevi[j].medie != elevi[j + 1].medie)
{
e += 1;
}
}
}
if (e)
{
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= n - i; j++)
{
if (elevi[j].medie < elevi[j + 1].medie)
{
elev temp = elevi[j];
elevi[j] = elevi[j + 1];
elevi[j + 1] = temp;
}
}
}
}
else
{
for (int i = 1; i <= n; i++)
{
for (int j = 1; j <= n - i; j++)
{
if (elevi[j].nume > elevi[j + 1].nume)
{
elev temp = elevi[j];
elevi[j] = elevi[j + 1];
elevi[j + 1] = temp;
}
}
}
}
cout << "Rezultate:";
for (int i = 1; i <= n; i++)
{
cout << '\n' << elevi[i].nume << ' ' << setprecision(2) << fixed << elevi[i].medie;
}
return 0;
}
Replace this line:
for (int i = 1; i <= n; i++)
with
for (int i = 0; i < n; ++i)
The error stems from trying to access the vector elevi at a position it doesn't yet have. Because vectors start indexing at 0, the first access made to elevi should be at index 0.
I have an assignment for school where I need to create a lottery program. It is supposed to allow the user to input six numbers and then generate six random numbers for comparison. I got the inputs working, but I have encountered a problem where the random number generator (located in the while loop) is stuck in an infinite loop, and I have absolutely no idea what is causing it since I have never had an infinite loop in any previous programs. If someone could please look through the code and possibly establish what is wrong, I would greatly appreciate it.
#include<iostream>
#include<time.h>
using namespace std;
void randomizeSeed();
int randomRange(int min, int max);
int getInteger();
int main()
{
randomizeSeed();
const int minNumber = 1;
const int maxNumber = 49;
const int Size = 6;
int luckyNumbers[6] = {};
int randomNumber = randomRange(minNumber, maxNumber);
int winningNumbers[6] = {};
cout << "Enter six numbers between 1 and 49...\n";
{
for (int i = 0; i < Size; i++)
{
luckyNumbers[i] = getInteger();
}
for (int i = 0; i < Size; i++)
{
for (int i = 0; i < Size - 1; i++)
{
if (luckyNumbers[i] > luckyNumbers[i + 1])
{
int temp = luckyNumbers[i];
luckyNumbers[i] = luckyNumbers[i + 1];
luckyNumbers[i + 1] = temp;
}
}
}
cout << "Lucky Numbers: ";
for (int i = 0; i < Size; i++)
{
cout << luckyNumbers[i] << " ";
}
cout << "\n";
cout << "Press any button to see the Winning Numbers.\n";
system("pause");
bool exist = true;
while (exist == true)
{
int count = 0;
cout << "Winning Numbers: ";
for (int j = 0; j < 6; j++)
{
winningNumbers[j] = randomRange(1, 49);
cout << winningNumbers[j] << " ";
system("pause");
}
}
}
}
void randomizeSeed()
{
srand(time(NULL));
}
int randomRange(int min, int max)
{
int randomValue = rand() % (max + 1 - min) + min;
return randomValue;
}
int getInteger()
{
int value = 0;
while (!(cin >> value) || (value >= 50) || (value <= 0))
{
cin.clear();
cin.ignore(numeric_limits<streamsize>::max(), '\n');
}
return value;
}
for (int i = 0; i < Size; i++)
for (int i = 0; i < Size - 1; i++)
if (luckyNumbers[i] > luckyNumbers[i + 1])
{
int temp = luckyNumbers[i];
luckyNumbers[i] = luckyNumbers[i + 1];
luckyNumbers[i + 1] = temp;
}
You have two loops and they both use i. You probably mean to use the second loop with another variable name, for example:
for (int i = 0; i < Size; i++)
{
for (int k = 0; k < Size - 1; k++)
{
if (luckyNumbers[i] > luckyNumbers[k + 1])
{
int temp = luckyNumbers[i];
luckyNumbers[i] = luckyNumbers[k + 1];
luckyNumbers[k + 1] = temp;
}
}
}
If you set your compiler warning level to 4 then compiler should warn you about these errors. Try to resolve all compiler warnings.
First i need to re-arrange all the values of my array into ascending order then add it afterwards. For example the user input 9 2 6, it will display in ascending order first ( 2 6 9 ) before it will add the sum 2 8 17.. The problem is my ascending order is not working, is there something wrong in my code?
#include <iostream>
#include<conio.h>
using namespace std;
int numberof_array, value[10], temp;
int i = 0, j;
void input()
{
cout << "Enter number of array:";
cin >> numberof_array;
for (i = 0; i < numberof_array; i++)
{
cout << "Enter value for array [" << i + 1 << "] - ";
cin >> value[i];
cout << endl;
}
}
void computation()
{
// this is where i'll put all the computation
for (j = 0; j < numberof_array; j++)
{
cout << value[j];
}
for (i = 0; i <= numberof_array; i++)
{
for (j = 0; j <= numberof_array - i; j++)
{
if (value[j] > value[j + 1])
{
temp = value[j];
value[j] = value[j + 1];
value[j + 1] = temp;
}
}
}
}
void display()
{
// display all the computation i've got
cout << "\nData after sorting: ";
for (j = 0; j < numberof_array; j++)
{
cout << value[j];
}
getch();
}
int main()
{
input();
computation();
display();
}
void computation(){
for (int j = 0; j < numberof_array; j++) cout << value[j]<<"\t";
for (int i = 0; i <= numberof_array; i++) {
temp = value[i];
int temp_idx = i;
for (int j = i; j < numberof_array; j++) {
if (value[j] < temp) {
temp = value[j];
temp_idx = j;
}
}
int temp_swap = value[i];
value[i] = value[temp_idx];
value[temp_idx] = temp_swap;
}
}
How about changing your second function to something like above.
I have to agree with other commentators that your coding style is not preferred but there might be more to the story than meets the eye.