oj.uz

Submission #154516

# Submission time Handle Problem Language Result Execution time Memory
154516 2019-09-22T11:48:45 Z Pankin Red-blue table (IZhO19_stones) C++14
100 / 100
 80 ms 1680 KB 
#include <bits/stdc++.h>

/*
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("-O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
*/

#define mp make_pair
#define ll long long
#define ld long double
#define pb push_back
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fs first
#define sc second
#define getfiles ifstream cin("input.txt"); ofstream cout("output.txt");
#define endl '\n'
#define con continue
#define pii pair<int, int>
#define all(x) x.begin(), x.end()

const int INF = 2000000005;
const ll BIG_INF = 2000000000000000005;
const int mod = 1000000007;
const int P = 31;
const ld PI = 3.141592653589793238462643;
const double eps = 1e-9;

using namespace std;

vector< pair<int, int> > dir = {
    {
        -1, 0
    },
    {
        0, 1
    },
    {
        1, 0
    },
    {
        0, -1
    }
};

bool valid(int x, int y, int n, int m) {
    return x >= 0 && y >= 0 && x < n && y < m;
}

mt19937 rng(1999999973);

inline int getAns(vector<vector<bool>> &a) {
    int ans = 0;
    for (int i = 0; i < a.size(); i++) {
        int diff = 0;
        for (int j = 0; j < a[0].size(); j++) {
            if (a[i][j])
                diff++;
            else
                diff--;
        }
        if (diff > 0)
            ans++;
    }
    for (int j = 0; j < a[0].size(); j++) {
        int diff = 0;
        for (int i = 0; i < a.size(); i++) {
            if (a[i][j])
                diff--;
            else
                diff++;
        }
        if (diff > 0)
            ans++;
    }
    return ans;
}

vector< vector<bool> > solve(int n, int m) {
    vector< vector<bool> > a(n, vector<bool>(m, true));
    int mxad = (m + 1) / 2 - 1, req = n - ((n + 1) / 2 - 1);
    priority_queue<pii> q;
    for (int i = 0; i < n; i++)
        q.push(mp(mxad, i));
    int cur_column = m - 1;
    while(true) {
        vector<pii> cur;
        cur.reserve(req);
        bool good = true;
        for (int i = 0; i < req; i++) {
            pii v = q.top();
            if (v.fs == 0) {
                good = false;
                break;
            }
            cur.pb(v);
            q.pop();
        }
        if (!good)
            break;
        for (int i = 0; i < req; i++) {
            a[cur[i].sc][cur_column] = false;
            q.push(mp(cur[i].fs - 1, cur[i].sc));
        }

        cur_column--;
    }
    return a;
}

signed main() {
    fast_io;

    int tests;
    cin >> tests;
    while(tests--) {
        int n, m;
        cin >> n >> m;
        vector<vector<bool>> a(n, vector<bool>(m, true));

        if (n >= m)
            a = solve(n, m);
        else {
            vector< vector<bool> > b(m, vector<bool>(n, true));
            b = solve(m, n);
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = !b[j][i];
                }
            }
        }

        cout << getAns(a) << endl;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                cout << (a[i][j] ? '+' : '-');
            }
            cout << endl;
        }
    }

    return 0;
}

Compilation message

stones.cpp: In function 'int getAns(std::vector<std::vector<bool> >&)':
stones.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a.size(); i++) {
                     ~~^~~~~~~~~~
stones.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 0; j < a[0].size(); j++) {
                         ~~^~~~~~~~~~~~~
stones.cpp:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int j = 0; j < a[0].size(); j++) {
                     ~~^~~~~~~~~~~~~
stones.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < a.size(); i++) {
                         ~~^~~~~~~~~~

Subtask #1
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 7 ms 404 KB Output is correct

Subtask #4
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 1400 KB Output is correct
2 Correct 72 ms 1516 KB Output is correct
3 Correct 66 ms 1448 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 71 ms 1336 KB Output is correct
2 Correct 62 ms 1360 KB Output is correct
3 Correct 57 ms 1272 KB Output is correct

Subtask #6
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 7 ms 404 KB Output is correct
5 Correct 77 ms 1400 KB Output is correct
6 Correct 72 ms 1516 KB Output is correct
7 Correct 66 ms 1448 KB Output is correct
8 Correct 71 ms 1336 KB Output is correct
9 Correct 62 ms 1360 KB Output is correct
10 Correct 57 ms 1272 KB Output is correct
11 Correct 21 ms 632 KB Output is correct
12 Correct 60 ms 1372 KB Output is correct
13 Correct 65 ms 1356 KB Output is correct
14 Correct 49 ms 1064 KB Output is correct
15 Correct 80 ms 1680 KB Output is correct
16 Correct 60 ms 1528 KB Output is correct
17 Correct 27 ms 888 KB Output is correct