Submission #169679

#	Time	Username	Problem	Language	Result	Execution time	Memory
169679		blast	Red-blue table (IZhO19_stones)	C++14	100 / 100	224 ms	2436 KiB

stones

#include <bits/stdc++.h>

//#define FILENAME ""

#define all(a) (a).begin(), (a).end()
#define sz(a) (int)(a).size()
#define pb push_back

#define F first
#define S second

using namespace std;

//#define int long long

const int N = 1e5 + 5;
const int INF = 1e9 + 5;
const double PI = acos(-1);

typedef long long ll;

const int dx[] = {1, -1, 0, 0};
const int dy[] = {0, 0, 1, -1};

const int mod = 1e9 + 7;

int T, n, m;
map<int,int> cnt;

int main() {
    #ifdef FILENAME
        freopen(FILENAME".in", "r", stdin);
        freopen(FILENAME ".out", "w", stdout);
    #endif
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> T;
    while(T--) {
        cin >> n >> m;
        char a[n + 5][m + 5];
        int ans = 0;
        if (n <= m) {
            for (int i = 1; i <= n; i++)
                for (int j = 1; j <= m; j++)
                    a[i][j] = '-';
            ans = m;
            for (int i = 1; i <= n; i++) {
                int res = (m + 2) / 2, mn = INF;
                for (int j = 1; j <= m; j++) {
                    mn = min(mn, cnt[j]);
                }
                int ct = 0;
                for (int j = 1; j <= m; j++) {
                    ct += (cnt[j] + 1 < (n + 1) / 2 ? 1 : 0);
                }
                if (ct < res) break;
                ans++;
                for (int j = 1; j <= m && res; j++) {
                    if (cnt[j] == mn) {
                        a[i][j] = '+';
                        cnt[j]++;
                        res--;
                    }
                }
                for (int j = 1; j <= m && res; j++) {
                    if (a[i][j] != '+') {
                        a[i][j] = '+';
                        cnt[j]++;
                        res--;
                    }
                }
            }
        } else {
            for (int i = 1; i <= n; i++)
                for (int j = 1; j <= m; j++)
                    a[i][j] = '+';
            ans = n;
            for (int j = 1; j <= m; j++) {
                int res = (n + 2) / 2, mn = INF;
                for (int i = 1; i <= n; i++) {
                    mn = min(mn, cnt[i]);
                }
                int ct = 0;
                for (int i = 1; i <= n; i++) {
                    ct += (cnt[i] + 1 < (m + 1) / 2 ? 1 : 0);
                }
                if (ct < res) break;
                ans++;
                for (int i = 1; i <= n && res; i++) {
                    if (cnt[i] == mn) {
                        a[i][j] = '-';
                        cnt[i]++;
                        res--;
                    }
                }
                for (int i = 1; i <= n && res; i++) {
                    if (a[i][j] != '-') {
                        a[i][j] = '-';
                        cnt[i]++;
                        res--;
                    }
                }
            }
        }
        cout << ans << "\n";
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++)
                cout << a[i][j];
            cout << "\n";
        }
        cnt.clear();
    }
    return 0;
}

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