Submission #296454

#	Time	Username	Problem	Language	Result	Execution time	Memory
296454		BeanZ	Remittance (JOI19_remittance)	C++14	100 / 100	277 ms	28664 KiB

remittance

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 1e6 + 5;
ll a[N], b[N];
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("balance.in", "r")){
                freopen("balance.in", "r", stdin);
                freopen("balance.out", "w", stdout);
        }
        ll n;
        cin >> n;
        for (int i = 1; i <= n; i++) cin >> a[i] >> b[i];
        while (true){
                bool flag = false;
                for (int i = 1; i < n; i++){
                        if (a[i] > b[i] && a[i] > 1){
                                ll rem = a[i] - b[i] + 1;
                                ll pass = rem / 2;
                                if ((pass * 2) > a[i]) pass--;
                                flag = true;
                                a[i + 1] += pass;
                                a[i] -= pass * 2;
                        }
                }
                if (a[n] > b[n] && a[n] > 1){
                        ll rem = a[n] - b[n] + 1;
                        ll pass = rem / 2;
                        if ((pass * 2) > a[n]) pass--;
                        flag = true;
                        a[1] += pass;
                        a[n] -= pass * 2;
                }
                if (!flag) break;
        }
        for (int i = 1; i <= n; i++){
                if (a[i] != b[i]) return cout << "No", 0;
        }
        cout << "Yes";
}
/*
*/

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:13:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   13 |                 freopen("balance.in", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:14:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |                 freopen("balance.out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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