Submission #564209

#	Time	Username	Problem	Language	Result	Execution time	Memory
564209		4fecta	Remittance (JOI19_remittance)	C++17	0 / 100	206 ms	576 KiB

remittance

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define ld long double
#define pii pair<int, int>
#define f first
#define s second
#define boost() cin.tie(0), cin.sync_with_stdio(0)

const int MN = 1000005;

int n;
pii a[MN * 2];

int fpow(int b, int p, int mod) {
    if (!p) return 1;
    int ret = fpow(b, p / 2, mod);
    if (p & 1) return ret * ret % mod * b % mod;
    return ret * ret % mod;
}

int32_t main() {
    boost();

    cin >> n;
    int suma = 0, sumb = 0;
    for (int i = 0; i < n; i++) {
        cin >> a[i].f >> a[i].s;
        suma += a[i].f * (1ll << i);
        sumb += a[i].s * (1ll << i);
    }
    int was = (1ll << n) - 1;
    int d = suma - sumb;
    //if (d % was != 0) return 0 * printf("No\n");
    for (int t = 0; t < 32; t++) { //wtf???
        for (int i = 0; i < n; i++) {
            if (a[i].s < a[i].f) {
                int d = (a[i].f - a[i].s + 1) / 2;
                a[i].f -= d * 2;
                a[(i + 1) % n].f += d;
            }
        }
    }

    int sum = 0;
    for (int i = 0; i < MN * 2; i++) {
        assert(a[i].f >= 0 && a[i].s >= 0);
        if (a[i].f != a[i].s) return 0 * printf("No\n");
        sum += fpow(2, i, was) * (a[i].f - a[i].s) % was;
    }
    if (sum % was == 0) printf("Yes\n");
    else printf("No\n");

    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int32_t main()':
remittance.cpp:34:9: warning: unused variable 'd' [-Wunused-variable]
   34 |     int d = suma - sumb;
      |         ^

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