Submission #299393

#	Time	Username	Problem	Language	Result	Execution time	Memory
299393		williamMBDK	Shortcut (IOI16_shortcut)	C++11	0 / 100	1 ms	256 KiB

shortcut

#include<bits/stdc++.h>
#include "shortcut.h"
using namespace std;
#define int long long
int N, C;
vector<signed> L, D;
int find_shortcut(signed _N, std::vector<signed> _l, std::vector<signed> _d, signed _C){
	L = _l, D = _d;	
	N = _N;
	C = _C;
	vector<pair<int,int>> dp (N);
	pair<int,int> best = {0, -1};
	for(int i = N - 1; i >= 0; i--){
		dp[i] = best;
		dp[i].first += D[i];
		if(i == 0) break;
		if(D[i] >= best.first){
			best = {D[i], i};
		}
		best.first += L[i-1];
	}
	best = {0,-1};
	int idx = -1;
	for(int i = 0; i < N; i++){
		if(dp[i] > best) best = dp[i], idx = i;
	}
	vector<int> dist (N);
	for(int i = 1; i < N; i++){
		dist[i] = dist[i-1] + L[i-1];
	}
	int a = idx, b = best.second;
	//cout << a << " " << b << endl;
	//cout << best.first << endl;
	int res = LLONG_MAX;
	for(int i = 0; i < N; i++){
		int mx = 0;
		for(int j = 0; j < N - 1; j++){
			int d = dp[j].first; // fine?
			int worst = dp[j].second;
			//cout << j << " " << worst << " " << dp[j].first << endl;
			d = min(d, D[j] + abs(dist[j] - dist[i]) + C + D[worst]);
			mx = max(d, mx);
		}
		//cout << i << " " << mx << endl;
		res = min(res, mx);
	}
	return res;
}

Compilation message (stderr)

shortcut.cpp: In function 'long long int find_shortcut(int, std::vector<int>, std::vector<int>, int)':
shortcut.cpp:31:6: warning: unused variable 'a' [-Wunused-variable]
   31 |  int a = idx, b = best.second;
      |      ^
shortcut.cpp:31:15: warning: unused variable 'b' [-Wunused-variable]
   31 |  int a = idx, b = best.second;
      |               ^

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3