Submission #733223

#	Time	Username	Problem	Language	Result	Execution time	Memory
733223		penguin133	Raisins (IOI09_raisins)	C++17	100 / 100	292 ms	72044 KiB

raisins

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

#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

int memo[55][55][55][55];
int n, m, A[55][55], P[55][55];

int dp(int x1, int x2, int y1, int y2){
	if(x1 == x2 && y1 == y2)return 0;
	if(memo[x1][x2][y1][y2] != -1)return memo[x1][x2][y1][y2];
	int ans = 1e18;
	for(int i=x1;i<x2;i++){
		ans = min(ans, dp(x1, i, y1, y2) + dp(i+1, x2, y1, y2));
	}
	for(int i=y1;i<y2;i++){
		ans = min(ans, dp(x1, x2, y1, i) + dp(x1, x2, i+1, y2));
	}
	return memo[x1][x2][y1][y2] = ans + (P[x2][y2] - P[x1-1][y2] - P[x2][y1-1] + P[x1-1][y1-1]);
}

void solve(){
	cin >> n >> m;
	for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)cin >> A[i][j], P[i][j] = P[i-1][j] + P[i][j-1] + A[i][j] - P[i-1][j-1];
	memset(memo, -1, sizeof(memo));
	cout << dp(1, n, 1, m) << '\n';
}

main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

raisins.cpp:37:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   37 | main(){
      | ^~~~

• Subtask 1: 100 / 100