Submission #722290

#	Time	Username	Problem	Language	Result	Execution time	Memory
722290		Dec0Dedd	Bodyguards (CEOI10_bodyguards)	C++14	100 / 100	135 ms	22324 KiB

bodyguards

#include <bits/stdc++.h>

using namespace std;

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

const ll INF = 1e9+10;

ll r, c;

int solve(vector<pii> vr, vector<pii> vc) {
    ll sz=vc.size(), pc[sz+100]={}, pcnt[sz+100]={};

    for (int i=0; i<sz; ++i) pc[i+1]=pc[i]+vc[i].first*vc[i].second;
    for (int i=0; i<sz; ++i) pcnt[i+1]=pcnt[i]+vc[i].second;

    ll sm=0, cnt=0, ls=0;
    for (auto u : vc) ls+=u.first*u.second;

    for (auto u : vr) {
        sm+=u.first*u.second, cnt+=u.second;

        int l=0, r=sz, res=sz-1;
        while (l <= r) {
            int m=(l+r)/2;
            if (vc[m].first >= cnt) l=m+1, res=m;
            else r=m-1;
        }
        if (vc[res].first < cnt) --res;

        

        if (pcnt[res+1] > LLONG_MAX/cnt) continue;
        ll g=1ll*pcnt[res+1]*cnt+(ls-pc[res+1]);
        assert(g >= 0);
        
        if (g < sm) return false;
    }

    return true;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);

    vector<pii> vr, vc;
    cin>>r;

    ll rsm=0, csm=0;
    for (int i=1; i<=r; ++i) {
        ll x, val; cin>>val>>x;
        vr.push_back({val, x});
        rsm+=val*x;   
    } sort(vr.begin(), vr.end(), greater<pii>());

    cin>>c;
    for (int i=1; i<=c; ++i) {
        ll x, val; cin>>val>>x;
        vc.push_back({val, x});
        csm+=val*x;
    } sort(vc.begin(), vc.end(), greater<pii>());

    if (rsm != csm) cout<<0<<"\n";
    else cout<<solve(vr, vc)<<"\n";
}

• 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