oj.uz

Submission #292137

# Submission time Handle Problem Language Result Execution time Memory
292137 2020-09-06T12:36:57 Z muhammad_hokimiyon Remittance (JOI19_remittance) C++14
0 / 100
 2 ms 384 KB 
#include <bits/stdc++.h>

#define fi first
#define se second
#define ll long long
#define dl double long

using namespace std;

const int N = 1e6 + 7;
const int M = 20 + 7;
const ll mod = 1e9 + 7;

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

int n;
ll a[N];
ll b[N];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    freopen( "input.txt" , "r" , stdin );
    freopen( "output.txt" , "w" , stdout );

    cin >> n;
    for( int i = 0; i < n; i++ ){
        cin >> a[i] >> b[i];
    }
    vector < int > used(n , 0);
    vector < pair < int , int > > cm;
    for( int i = 0; i < n; i++ ){
        if( used[i] )break;
        if( a[i] >= b[i] ){
            int j = (i - 1 + n) % n;
            while( a[j] < b[j] ){
                used[j] = true;
                j = (j - 1 + n) % n;
                if( used[j] ){
                    cout << "No";
                    return 0;
                }
            }
            int x = (i - 1 + n) % n;
            if( x != j )cm.push_back({ x , (j + 1) % n });
        }
    }
    for( int i = 0; i < n; i++ )used[i] = false;
    reverse( cm.begin() , cm.end() );
    for( int i = 0; i < (int)cm.size(); i++ ){
        auto x = cm[i];
        ll cost = b[x.fi] - a[x.fi];
        cost += cost;
        a[x.fi] = b[x.fi];
        used[x.fi] = true;
        x.fi = (x.fi - 1 + n) % n;
        while( a[x.fi] - cost < b[x.fi] ){
            cost = b[x.fi] - a[x.fi] + cost;
            cost *= 2;
            a[x.fi] = b[x.fi];
            if( used[x.fi] ){
                cout << "No";
                return 0;
            }
            used[x.fi] = 1;
            x.fi = (x.fi - 1 + n) % n;
        }
        a[x.fi] -= cost;
    }
    for( int j = 0; j < 40; j++ ){
        for( int i = 0; i < n; i++ ){
            if( a[i] % 2 != b[i] % 2 ){
                cout << "No";
                return 0;
            }
            int nx = (i + 1) % n;
            a[nx] += (b[i] - a[i]) / 2;
            a[i] = b[i];
        }
    }
    cout << "Yes";
}

Compilation message

remittance.cpp: In function 'int main()':
remittance.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     freopen( "input.txt" , "r" , stdin );
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:26:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   26 |     freopen( "output.txt" , "w" , stdout );
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 40.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 45.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -