Submission #489546

#	Time	Username	Problem	Language	Result	Execution time	Memory
489546		wiwiho	Remittance (JOI19_remittance)	C++14	100 / 100	223 ms	15988 KiB

remittance

#include<bits/stdc++.h>

#define mp make_pair
#define F first
#define S second
#define printv(a, b) { \
    for(auto pv : a) b << pv << " "; \
    b << "\n";\
}
#define eb emplace_back

using namespace std;

typedef long long ll;

using pii = pair<int, int>;
using pll = pair<ll, ll>;

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

    int n;
    cin >> n;

    vector<ll> a(n), b(n);
    for(int i = 0; i < n; i++) cin >> a[i] >> b[i];

    int now = 0;
    int tmp = 0;
    while(tmp < n){
        int nxt = (now + 1) % n;

        int cnt = max(0LL, (a[now] - b[now] + 1) / 2);
        if(a[now] < cnt * 2) cnt--;
        a[now] -= cnt * 2;
        a[nxt] += cnt;
        if(!cnt) tmp++;
        else tmp = 0;

        //cerr << "test " << now << "  ";
        //printv(a, cerr);
        now = (now + 1) % n;
    }

    for(int i = 0; i < n; i++){
        if(a[i] != b[i]){
            cout << "No\n";
            return 0;
        }
    }
    cout << "Yes\n";

    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45