Submission #654498

#	Time	Username	Problem	Language	Result	Execution time	Memory
654498		SOCIOPATE	Remittance (JOI19_remittance)	C++17	0 / 100	1 ms	340 KiB

remittance

#ifdef LOCAL
    #define _GLIBCXX_DEBUG
#endif

#include <bits/stdc++.h>

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

#define pll pair<ll, ll>
#define pii pair<int, int>
#define pdd pair<ld, ld>
#define ff first
#define ss second
#define all(v) v.begin(),v.end()

typedef tree<
    pii,
    null_type,
    less<pii>,
    rb_tree_tag,
    tree_order_statistics_node_update> ordset;

#pragma GCC optimize("-O3")
#pragma GCC optimize("unroll-loops")

ll INF = 2e18;
const ll mod = 1000000007;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

ll binpow(ll n, ll m){
    if(m == 0) return 1ll;
    if(m & 1ll) return (n * binpow(n, m - 1ll)) % mod;
    ll b = binpow(n, m / 2ll);
    return (b*b) % mod;
}

void solve(){
    int n;
    cin >> n;
    vector<int> a(n), b(n);
    ll tosend = 0, need = 0;
    for(int i = 0; i < n; i++){
        cin >> a[i] >> b[i];
        if(a[i] < b[i]) need += b[i] - a[i];
        else {
            int diff = a[i] - b[i];
            tosend += diff / 2;
            if(diff & 1){
                need++;
                tosend++;
            }
        }
        //cout << need << ' ' << tosend << '\n';
    }
    cout << (need <= tosend ? "Yes" : "No");
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    #ifdef LOCAL
        freopen("input.txt", "r", stdin);
        //freopen("output.txt", "w", stdout);
    #endif
	int tt;
    //cin >> tt;
    tt = 1;
	while (tt--) {
		solve();
		#ifdef LOCAL
            cout << "__________________________________" << endl;
		#endif
	}
	#ifdef LOCAL
        cout << "finished in " << clock() * 1.0 / CLOCKS_PER_SEC << "sec" << '\n';
	#endif
	return 0;
}

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