Submission #1142456

#	Time	Username	Problem	Language	Result	Execution time	Memory
1142456		Noproblem29	Remittance (JOI19_remittance)	C++20	100 / 100	118 ms	16184 KiB

remittance

#include<bits/stdc++.h>
using namespace std;
#ifndef BADGNU
#pragma GCC target("sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#endif
#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3")
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;
#define ll long long
#define int ll
#define ld long double
#define y1 cheza
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> using ordered_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
template<class T> using ordered_multiset = tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;
const int N=1e6+100;
const int M=5001;
const int B=447;
const int mod=998244353;
const ll INF=1e18;
const int dx[]={1,-1,0,0};
const int dy[]={0,0,1,-1};
const double eps=1e-6;
int n;
int a[N],b[N];
bool check(){
    for(int i=0;i<n;i++){
        if(b[i]>0){
            return 0;
        }
    }
    return 1;
}
void test(){
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>a[i]>>b[i];
    }
    if(check()){
        for(int j=0;j<n;j++){
            if(a[j]>0){
                cout<<"No\n";
                return;
            }
        }
        cout<<"Yes\n";
        return;
    }
    while(1ll){
        bool ok=0;
        for(int j=0;j<n;j++){
            if(a[j]>b[j]){
                int d=(a[j]-b[j]+1)/2;
                a[j]-=d*2;
                a[(j+1)%n]+=d;
                ok=1;
            }
        }
        if(ok==0){
            break;
        }
    }
    for(int j=0;j<n;j++){
        if(a[j]!=b[j]){
            cout<<"No\n";
            return;
        }
    }
    cout<<"Yes\n";
}



/*

*/
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    // cout.tie(nullptr);
    int t2=1;
    // cin>>t2;
    for(int i=1;i<=t2;i++){
        test();
    }
}

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