Submission #1272085

#	Time	Username	Problem	Language	Result	Execution time	Memory
1272085		coderpemula	Zemljište (COCI22_zemljiste)	C++20	70 / 70	1268 ms	2308 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define fi first
#define se second
#define pb push_back
using namespace std;
ll pref[501][501];
int main()
{
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	int n,m,L,R,M,i,j,k;
	ll x,ans=1e18,now,tb,a,b,nw;
	cin>>n>>m>>a>>b;
	if(a > b) swap(a,b);
	for(i=1;i<=n;i++){
		for(j=1;j<=m;j++){
			cin>>x;
			pref[i][j] = x+pref[i-1][j]+pref[i][j-1]-pref[i-1][j-1];
			if(pref[i][j] < a){
				ans = min(ans,a+b-2*pref[i][j]);
				continue;
			}
			if(pref[i][j] >= a and pref[i][j] <= b or x >= a and x <= b){
				cout<<b-a;
				return 0;
			}
			for(k=j;k>=1;k--){
				// ambil k,j
				now = pref[i][j]-pref[i][k-1];
				L = 1, R = i;
				while(L <= R){
					M = (L+R)/2;
					// ambil row M,i
					tb = -pref[M-1][j]+pref[M-1][k-1];
					nw = now+tb;
					if(nw < a){
						ans = min(a+b-2*nw,ans);
						R = M-1;
						continue;
					}
					if(nw > b){
						ans = min(ans,2*nw-a-b);
						L = M+1;
						continue;
					}
					cout<<b-a;
					return 0;
				}
			}
		}
	}
	cout<<ans;
	
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 40 / 40