Submission #1305072

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305072		hoa208	Remittance (JOI19_remittance)	C++20	0 / 100	13 ms	580 KiB

remittance

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
const   ll mod = 1e9 + 7;
const   ll INF = 1e18;
//--------------------------------------------------------------------
const ll N = 1e6 + 10;
ll a[N], b[N];
ll n;
void hbmt() {
    cin >> n;
    FOR(i, 1, n) {
        cin >> a[i] >> b[i];
    }
    ll cnt = 10000000;
    ll u = 1;
    while(cnt--) {
        ll c = b[u] - a[u];
        ll v = u == 1 ? v = n : v = u - 1;
        if(c <= 0) {
            u = v;
            continue;
        }
        a[u] = b[u];
        if(v == 0) {
            v = n;
        }
        a[v] -= 2 * c;
        u = v;
    }
    cnt = 0;
    bool nope1 = 0;
    FOR(i, 1, n) {
        if(a[i] != b[i]) {
            nope1 = 1;
        }
        if(a[i] > b[i] ) {
            cnt++;
        }
    }
    if(cnt == n) {
        cout << "Yes\n";
    }
    else if(nope1) {
        cout << "No\n";
    }
    else
    cout << "Yes\n";
}

int main() {

    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);

    #define NAME "hbmt"
    if(fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }

    //int t;cin>>t;while(t--)
    hbmt();
    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
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".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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