Submission #1102155

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102155		ro9669	Remittance (JOI19_remittance)	C++17	100 / 100	337 ms	16072 KiB

remittance

#include <bits/stdc++.h>
#define fi first
#define se second
#define all(v) v.begin() , v.end()
#define sz(v) int(v.size())
#define unq(v) sort(all(v)); v.resize(unique(all(v)) - v.begin());
using namespace std;

typedef long long ll;
typedef pair<int , int> ii;
typedef pair<long long , int> lli;

const int maxN = int(1e6)+7;

int n;
ll a[maxN] , b[maxN];

bool check(){
    for (int i = 0 ; i < n ; i++){
        if (a[i] != b[i]) return 0;
    }
    return 1;
}

void solve(){
    cin >> n;
    for (int i = 0 ; i < n ; i++){
        cin >> a[i] >> b[i];
    }
    for (int t = 0 ; t < 30 ; t++){
        for (int i = 0 ; i < n ; i++){
            if (a[i] >= b[i]){
                ll x = (a[i] - b[i]) / 2;
                a[i] -= 2 * x;
                a[(i + 1) % n] += x;
            }
        }
    }
    for (int i = 0 ; i < n ; i++){
        if (a[i] < b[i]){
            cout << "No\n";
            return;
        }
    }
    if (check()){
        cout << "Yes\n";
        return;
    }
    bool ok = 0;
    for (int i = 0 ; i < n ; i++){
        if (a[i] == b[i]){
            cout << "No\n";
            return;
        }
        if (a[i] > 1) ok = 1;
    }
    if (ok) cout << "Yes\n"; else cout << "No\n";
}

#define name "A"

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(name".INP" , "r")){
        freopen(name".INP" , "r" , stdin);
        freopen(name".OUT" , "w" , stdout);
    }
    int t = 1; //cin >> t;
    while (t--) solve();
    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(name".INP" , "r" , stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(name".OUT" , "w" , stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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