Submission #963455

#	Time	Username	Problem	Language	Result	Execution time	Memory
963455		noobcodur	Remittance (JOI19_remittance)	C++14	100 / 100	166 ms	36496 KiB

remittance

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

using ld = long double;

#define int long long
#define pii pair<int,int>
#define forn(i,j) for(int i = 0; i < j; ++i)
#define forrange(i,j,k) for(int i = j; i < k; ++i)
#define vi vector<int>
#define vpii vector<pii>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()

const int MOD = 1e9+7; const int INF = 1e17+1; const int maxN = 1e6+1;

void setIO(string name){
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	if(!name.empty()){
		freopen((name + ".in").c_str(),"r",stdin);
		freopen((name + ".out").c_str(),"w",stdout);
	}
}

int a[maxN],b[maxN];

signed main(){
	setIO("");
	int n; cin >> n;

	forn(i,n) cin >> a[i] >> b[i];

	while(maxN){
		int freq = 0;

		forn(i,n){
			if(a[i] <= b[i]) continue;
			int x = (a[i]-b[i]+1)/2;

			if(x && a[i] - 2*x >= 0){
				a[i] -= 2*x;
				a[(i+1) % n] += x;

				freq++;
			}
		}

		if(!freq) break;
	}

	forn(i,n){
		if(a[i] != b[i]){
			cout << "No" << endl;
			return 0;
		}
	}

	cout << "Yes" << endl;
}

Compilation message (stderr)

remittance.cpp: In function 'void setIO(std::string)':
remittance.cpp:24:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   freopen((name + ".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:25:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   freopen((name + ".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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