Submission #1305083

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305083		hoa208	Remittance (JOI19_remittance)	C++20	100 / 100	176 ms	25332 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;
bool mark[N];
void hbmt() {
    cin >> n;
    queue<ll> q;
    FOR(i, 1, n) {
        cin >> a[i] >> b[i];
        if(a[i] > b[i] + 1) {
                mark[i] = 1;
            q.push(i);
        }
    }
    while(!q.empty()) {
        ll u = q.front();
        q.pop();
        ll v = u + 1 > n ? 1 : u + 1;
        ll dd = a[u] - b[u];
        ll k = dd / 2;
        mark[u] = 0;
        a[u] -= 2 * k;
        a[v] += k;
        if(a[v] > b[v] + 1 && !mark[v]){
            mark[v] = 1;
            q.push(v);
        }
    }
//    FOR(i, 1, n) {
//        cout << a[i] << ' ';
//    }
//    cout << '\n';
//    FOR(i, 1, n) {
//        cout << b[i] << ' ';
//    }
//    cout << '\n';
    bool ok1 = 1, ok2 = 0;
    FOR(i, 1, n) {
        if(a[i] - b[i] != 1) {
            ok1 = false;
        }
        if(a[i] != 1) {
            ok2 = true;
        }
    }
    if(ok1 && ok2) {
        cout << "Yes\n";
        return;
    }
    FOR(i, 1, n) {
        if(a[i] != b[i]) {
            cout << "No\n";
            return;
        }
    }
    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:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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