Submission #1298283

#	Time	Username	Problem	Language	Result	Execution time	Memory
1298283		daotuankhoi	Remittance (JOI19_remittance)	C++20	0 / 100	1 ms	576 KiB

remittance

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long

#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif

template <class T> bool ckmax(T &a, T b) { return a < b ? (a = b, true) : false; }
template <class T> bool ckmin(T &a, T b) { return a > b ? (a = b, true) : false; }

const int MAXN = 1e6 + 5;
int a[MAXN], b[MAXN];
int main() {
    #define NAME "test"
    if (fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n; cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i] >> b[i];
    }
    for (int i = 0; i < n; i++) {
        int rem = a[i] - b[i];
        if (rem <= 0) continue;
        if (rem & 1) rem--;
        a[i] -= rem;
        a[(i + 1) % n] += rem / 2;
    }
    for (int i = 0; i < n; i++) {
        int rem = a[i] - b[i];
        if (rem <= 0) continue;
        if (rem & 1) rem--;
        a[i] -= rem;
        a[(i + 1) % n] += rem / 2;
    }
    for (int i = 0; i < n; i++) {
        if (a[i] != b[i]) return cout << "No\n", 0;
    }
    cout << "Yes\n";
    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45