Submission #251108

#	Time	Username	Problem	Language	Result	Execution time	Memory
251108		Mercenary	Remittance (JOI19_remittance)	C++14	100 / 100	306 ms	28752 KiB

remittance

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
typedef tree <pair<ll,int>,null_type,less<pair<ll,int>>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;

const int maxn = 1e6 + 5;
int n;
int a[maxn] , b[maxn];
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
        freopen(taskname".INP", "r",stdin);
        freopen(taskname".OUT", "w",stdout);
    }
    cin >> n;
    for(int i = 0 ; i < n ; ++i){
        cin >> a[i] >> b[i];
    }
    do{
        bool ok = 0;
        for(int i = 0 ; i < n ; ++i){
            if(a[i] <= b[i] || a[i] <= 1)continue;
            int tmp = max(1 , (a[i] - b[i]) / 2);
            a[i] -= 2 * tmp;
            a[(i + 1) % n] += tmp;
            ok = 1;
        }
        if(!ok)break;
    }while(true);
    for(int i = 0 ; i < n ; ++i){
        if(a[i] != b[i])return cout << "No" , 0;
    }
    cout << "Yes";
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:25:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(taskname".INP", "r",stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
remittance.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen(taskname".OUT", "w",stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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