제출 #1108490

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1108490		vjudge1	Art Exhibition (JOI18_art)	C++17	100 / 100	134 ms	8520 KiB

art

#include <bits/stdc++.h>
#define ll long long
#define pii pair < ll , ll > 
#define fi first
#define se second
using namespace std;
const int N = 5e5;
int n;
pii a[N + 5];
ll res = 0 , maxvl;
void init()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    if(fopen("shopping2.INP" , "r"))
    {
        freopen("shopping2.INP" , "r" , stdin);
        freopen("shopping2.OUT" , "w" , stdout);
    }
}
int power(ll a , ll b , ll mod)
{
    ll ans = 1;
    while(b)
    {
        if(b & 1) ans = ans * a % mod;
        a = a * a % mod;
        b >>= 1;
    }
    return ans;
}
int main()
{
    init();
    cin >> n;
    for(int i = 1 ; i <= n ; i ++)
    {
        cin >> a[i].fi >> a[i].se;
        res = max(res , a[i].se);
    }
    sort(a + 1 , a + n + 1);
    ll sum = a[1].se;
    maxvl = a[1].fi;
    for(int i = 2 ; i <= n ; i ++)
    {
        sum += a[i].se;
        res = max(res , sum - a[i].fi + maxvl);
        maxvl = max(maxvl , a[i].fi - sum + a[i].se);
    }
    cout << res;
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

art.cpp: In function 'void init()':
art.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen("shopping2.INP" , "r" , stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
art.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen("shopping2.OUT" , "w" , stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50