Submission #778409

#	Time	Username	Problem	Language	Result	Execution time	Memory
778409		vjudge1	Roller Coaster Railroad (IOI16_railroad)	C++17	0 / 100	39 ms	3404 KiB

railroad

#include<bits/stdc++.h>
using namespace std;
#include "railroad.h"
const int N = 4e5+37;
long long int mp[(1<<16)][16];



void f(){
	freopen("in.txt", "r", stdin);
	freopen("out.txt", "w", stdout);
}



long long plan_roller_coaster(std::vector<int> s, std::vector<int> t) {

	if(s.size()>16) return 0;
	int n=s.size();
	vector<int> b[n+1];

	for(int i=0; i<(1<<n); i++){
		for(int j=0; j<n; j++){
			mp[i][j] = 2e18;
		}
	}

	for(int i=1; i<(1<<n); i++){
		int f=0, p=0;
		for(int j=0; j<n; j++){
			if(i&(1<<j)) p++, f=j; 
		}

		if(p==1) mp[i][f] = 1;
		else b[p-1].push_back(i);
	}

		long long ans=2e18;


	for(int i=1; i<n+1; i++){
		for(auto l: b[i]){
			for(int sil=0; sil<n; sil++){
				if(l&(1<<sil)){
					for(int x=0; x<n; x++){
						mp[l][sil] = min(mp[l][sil], mp[l^(1<<sil)][x]+(max(0, t[x]-s[sil])));
					}
				}

				if(b[i].size()==1){
					ans=min(ans, mp[l][sil]);
				}
			}

		}
	}
	return ans;
}
/*
int main() {

	f();
    int n;
    assert(1 == scanf("%d", &n));
    std::vector<int> s(n), t(n);
    for (int i = 0; i < n; ++i)
        assert(2 == scanf("%d%d", &s[i], &t[i]));
    long long ans = plan_roller_coaster(s, t);
    printf("%lld\n", ans);
    return 0;
}*/

Compilation message (stderr)

railroad.cpp: In function 'void f()':
railroad.cpp:10:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |  freopen("in.txt", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
railroad.cpp:11:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  freopen("out.txt", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 23
• Subtask 3: 0 / 30
• Subtask 4: 0 / 36