Submission #1093909

#	Time	Username	Problem	Language	Result	Execution time	Memory
1093909		KasymK	Red-blue table (IZhO19_stones)	C++17	100 / 100	23 ms	5212 KiB

stones

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}

void solve(int green_flecks){
    int n, m;
    scanf("%d%d", &n, &m);
    bool ok = 0;
    if(n < m){
        swap(n, m);
        ok = 1;
    }
    vector<vector<int>> A(n, vector<int> (m, 1));
    int answer = n, cnt = 0, j_ = 0;
    for(int ad = 0; ad < (m-1)>>1; ++ad)
        for(int i = 0; i < n; ++i){
            A[i][j_] = 0, cnt++;
            if(cnt == (n>>1)+1)
                j_++, answer++, cnt = 0;
        }
    // wr;
    // for(int i = 0; i < n; ++i){
    //     for(int j = 0; j < m; ++j)
    //         printf("%d", A[i][j]);
    //     puts("");
    // }
    // wr;
    // printf("%d %d %d\n", cnt, answer, j_);
    // wr;
    printf("%d\n", answer);
    if(ok){
        for(int i = 0; i < n; ++i)
            for(int j = 0; j < m; ++j)
                A[i][j] ^= 1;
        for(int j = 0; j < m; ++j){
            for(int i = 0; i < n; ++i)
                if(A[i][j])
                    printf("+");
                else
                    printf("-");
            puts("");
        }
        return;
    }
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < m; ++j)
            if(A[i][j])
                printf("+");
            else
                printf("-"); 
        puts("");
    }
}

int main(){
    int tt;
    scanf("%d", &tt);
    while(tt--)
        solve(tt);
    return 0;
}

Compilation message (stderr)

stones.cpp: In function 'void solve(int)':
stones.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
stones.cpp: In function 'int main()':
stones.cpp:68:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |     scanf("%d", &tt);
      |     ~~~~~^~~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 10 / 10
• Subtask 3: 16 / 16
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 31 / 31