Submission #136899

#	Time	Username	Problem	Language	Result	Execution time	Memory
136899		choikiwon	Bodyguards (CEOI10_bodyguards)	C++17	100 / 100	169 ms	13028 KiB

bodyguards

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

int R, C;
vector<pii> X, Y;
vector<ll> csum;
vector<ll> psum;

ll f(ll k) {
    int s = 0, e = (int)Y.size() - 1, p = -1;
    while(s <= e) {
        int m = (s + e)>>1;

        if(Y[m].first >= k) {
            p = m;
            s = m + 1;
        }
        else e = m - 1;
    }

    ll ret = psum.back();
    if(p != -1) {
        ret += csum[p] * k;
        ret -= psum[p];
    }
    return ret;
}

int main() {
    std::ios::sync_with_stdio(false);

    cin >> R;

    for(int i = 0; i < R; i++) {
        int a, b; cin >> a >> b;

        X.push_back(pii(a, b));
    }

    cin >> C;

    for(int i = 0; i < C; i++) {
        int a, b; cin >> a >> b;

        Y.push_back(pii(a, b));
    }

    sort(X.begin(), X.end());
    sort(Y.begin(), Y.end());
    reverse(X.begin(), X.end());
    reverse(Y.begin(), Y.end());

    csum.resize(Y.size());
    psum.resize(Y.size());
    for(int i = 0; i < Y.size(); i++) {
        csum[i] = Y[i].second;
        psum[i] = 1LL * Y[i].first * Y[i].second;
        if(i) {
            csum[i] += csum[i - 1];
            psum[i] += psum[i - 1];
        }
    }

    ll sum = 0;
    ll k = 0;
    for(int i = 0; i < X.size(); i++) {
        sum += 1LL * X[i].first * X[i].second;
        k += X[i].second;

        if(sum > f(k)) {
            cout << 0;
            return 0;
        }
    }
    cout << 1;
}

Compilation message (stderr)

bodyguards.cpp: In function 'int main()':
bodyguards.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < Y.size(); i++) {
                    ~~^~~~~~~~~~
bodyguards.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < X.size(); i++) {
                    ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10