Submission #100003

#	Time	Username	Problem	Language	Result	Execution time	Memory
100003		jamielim	Roller Coaster Railroad (IOI16_railroad)	C++14	Compilation error	0 ms	0 KiB

railroad

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

long long adj[20][20];
long long memo[20][66000];

long long tsp(int x,int bm){
    if(memo[x][bm]!=-1)return memo[x][bm];
    if(bm==0)return memo[x][bm]=0;
    long long ans=1000000000000000010;
    int bm2=bm;
    while(bm2&(-bm2)){
        int y=__builtin_ctz(bm2);
        ans=min(ans,tsp(y,bm-(bm2&(-bm2)))+adj[x][y]);
        bm2-=(bm2&(-bm2));
    }
    return memo[x][bm]=ans;
}

long long plan_roller_coaster(vector<int> s, vector<int> t) {
    int n=(int)s.size();
    if(n>16){
        return 1;
    }
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(i==j)adj[i][j]=0;
            else adj[i][j]=max(0,t[i]-s[j]);
        }
    }
    memset(memo,-1,sizeof(memo));
    long long ans=4000000000000000010;
    for(int i=0;i<n;i++){
        ans=min(ans,tsp(i,(1<<n)-1-(1<<i)));
    }
    return ans;
}

int main() {
    int n;
    assert(1 == scanf("%d", &n));
    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)

/tmp/ccDfcuJK.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccGJUgik.o:railroad.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status