Submission #1039740

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039740		phong	Remittance (JOI19_remittance)	C++17	100 / 100	523 ms	52308 KiB

remittance

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
//#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>

#define ll long long
const int nmax = 1e6 + 5, N = 1e5;
const ll oo = 1e9;
const int lg = 31, M = 2, mod = 1e6;
#define pii pair<ll, ll>
#define fi first
#define se second
#define debug(a, n) for(int i = 1; i <= n; ++i) cout << a[i] << ' '; cout << "\n";
#define endl "\n"
#define task "code"
using namespace std;

int n;
pii a[nmax], b[nmax];
bool check(){
    int bs = 40;
    while(bs--){
        for(int i = 0; i < n; ++i){
            if(a[i].fi > a[i].se){
                ll x = (a[i].fi - a[i].se) / 2;
                a[i].fi -= x * 2;
                a[(i + 1) % n].fi += x;
            }
        }
    }
    bool ok = 1;
    for(int i = 0; i < n;++i){
        ok &= (a[i].fi == a[i].se);
    }
    return ok;

}
main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
//    freopen(task".inp", "r", stdin);
//    freopen(task".out", "w", stdout);
    cin >> n;
    for(int i = 0; i < n; ++i) cin >> a[i].fi >> a[i].se;
    if(check()) cout << "Yes", exit(0);
    int lc = -1, pc = -1;
    for(int i = 0; i < n; ++i){
        if(a[i].fi > a[i].se && a[i].fi > 1){
            if(lc == -1) lc = i;
            pc = i;
        }
        b[i] = a[i];
    }
    if(lc != -1){
        ll x = (a[lc].fi - a[lc].se + 1) / 2;
        a[lc].fi -= x * 2;
        a[(lc + 1) % n].fi += x;
        if(check()) cout << "Yes", exit(0);
        for(int i = 0; i < n; ++i) a[i] = b[i];
        x = (a[pc].fi - a[pc].se + 1) / 2;
        a[pc].fi -= x * 2;
        a[(pc + 1) % n].fi += x;
        if(check()) cout << "Yes", exit(0);
    }
    cout << "No";
}
/*
3 5
12345678
000
0??
1?0
?11
???

3 1
12345678
???
*/

Compilation message (stderr)

remittance.cpp:38:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   38 | main(){
      | ^~~~

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