Submission #568533

#	Time	Username	Problem	Language	Result	Execution time	Memory
568533		nafis_shifat	Skyline (IZhO11_skyline)	C++17	0 / 100	1 ms	596 KiB

skyline

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
using namespace std;
const int mxn=300+5;
const int inf=1e9;
const int mxv = 201;
int n, h[mxn];
int dp[mxn][mxv][mxv]; 
int gp[mxn][mxv];
int main() {
	cin >> n;
	for(int i = 1; i <= n; i++) {
		cin >> h[i];
	}

	for(int i = 0; i <= n; i++) for(int j = 0; j <= mxv; j++) for(int k = 0; k <= mxv; k++) {
		dp[i][j][k] = inf;
		gp[i][j] = inf;
	}

	for(int i = 0; i <= min(h[1], h[2]); i++) {
		dp[2][i][0] = 5 * i + 3 * (h[2] - i) + 3 * (h[1] - i);
	}
	for(int i = min(h[1], h[2]); i>= 0; i--) gp[2][i] = min(gp[2][i + 1], dp[2][i][0]);


	for(int p = 3; p <= n; p++) {
		for(int i = 0; i <= min(h[p], h[p - 1]); i++) {
			for(int j = 0; j <= min(h[p] - i, h[p - 1] - i); j++) {
				dp[p][i][j] = gp[p - 1][j] + 2 * (i + j) + 3 * (h[p] - i - j);
			}
		}

		for(int i = mxv - 1; i >= 0; i--) {
			gp[p][i] = inf;
			for(int j = 0; j <= mxv; j++) gp[p][i] = min(gp[p][i], dp[p][i][j]);
			gp[p][i] = min(gp[p][i], gp[p][i + 1]);
		}
	}



	cout<<gp[n][0]<<endl;
}

Compilation message (stderr)

skyline.cpp: In function 'int main()':
skyline.cpp:18:15: warning: iteration 201 invokes undefined behavior [-Waggressive-loop-optimizations]
   18 |   dp[i][j][k] = inf;
      |   ~~~~~~~~~~~~^~~~~
skyline.cpp:17:77: note: within this loop
   17 |  for(int i = 0; i <= n; i++) for(int j = 0; j <= mxv; j++) for(int k = 0; k <= mxv; k++) {
      |                                                                           ~~^~~~~~

• Subtask 1: 0 / 100