Submission #1209664

#	Time	Username	Problem	Language	Result	Execution time	Memory
1209664		nguyn	Group Photo (JOI21_ho_t3)	C++20	0 / 100	0 ms	328 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define ll long long 
#define F first
#define S second
#define pb push_back 
#define pii pair<int,int>

const int N = 5e3 + 5;

int n; 
int h[N];
int pos[N];
int f[N];

signed main(){
    ios_base::sync_with_stdio(false) ; 
    cin.tie(0) ; cout.tie(0) ; 
    if (fopen("INP.INP" ,"r")) {
        freopen("INP.INP" ,"r" , stdin) ;
        freopen("OUT.OUT" , "w" , stdout) ;
    }
    cin >> n;
    for (int i = 1; i <= n; i++) {
    	cin >> h[i];
    	pos[h[i]] = i;
    }
    for (int i = 1; i <= n; i++) f[i] = 1e9; 
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <= i; j++) {
    		int cost = 0; 
    		for (int k = i, cur = j; k > j; k--, cur++) {
    			if (cur < pos[k]) cost += pos[k] - cur; 
    		}
    		if (i < pos[j]) cost += pos[j] - i;
    		f[i] = min(f[i], f[j - 1] + cost);
    	}
    }
    cout << f[n];
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen("INP.INP" ,"r" , stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("OUT.OUT" , "w" , stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36