Submission #32136

#	Time	Username	Problem	Language	Result	Execution time	Memory
32136		imaxblue	Cities (BOI16_cities)	C++14	74 / 100	3223 ms	262144 KiB

cities

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define pii pair<int, int>
#define p3i pair<pii, int>
#define pll pair<ll, ll>
#define p3l pair<pll, ll>
#define lseg L, (L+R)/2, N*2+1
#define rseg (L+R)/2+1, R, N*2+2
#define ub upper_bound
#define lb lower_bound
#define pq priority_queue
#define MN 1000000007
#define fox(k, x) for (int k=0; k<x; ++k)
#define fox1(k, x) for (int k=1; k<=x; ++k)
#define foxr(k, x) for (int k=x-1; k>=0; --k)
#define fox1r(k, x) for (int k=x; k>0; --k)
#define ms multiset
#define flood(x) memset(x, 0x3f3f3f3f, sizeof x)
#define drain(x) memset(x, 0, sizeof x)
#define rng() (rand() >> 3)*rand()
 
int n, m, k, a, b, c, N, B;
ll dis[33][100005], D;
bool u[33][100005];
vector<pii> v[100005];
pq<pair<pair<ll, int>, int> > q;
int main(){
    scanf("%i%i%i", &n, &k, &m);
    fox(l, (1 << k)){
        fox1(l2, n) dis[l][l2]=(1LL << 60);
    }
    fox(l, k){
        scanf("%i", &a);
        q.push(mp(mp(0, 1 << l), a));
      	dis[1 << l][a]=0;
    }
    fox(l, m){
        scanf("%i%i%i", &a, &b, &c);
        v[a].pb(mp(b, c));
        v[b].pb(mp(a, c));
    }
    while(!q.empty()){
        N=q.top().y; D=-q.top().x.x; B=q.top().x.y; q.pop();
        if (u[B][N]) continue;
        u[B][N]=1;
        //cout << N << ' ' << B << endl;
        if (B==(1 << k)-1){
            cout << D << endl;
            return 0;
        }
        fox(l, (1 << k)){
            if (dis[B|l][N]>D+dis[l][N]){
                dis[B|l][N]=D+dis[l][N];
                q.push(mp(mp(-D-dis[l][N], B|l), N));
            }
        }
        fox(l, v[N].size()){
            if (dis[B][v[N][l].x]>D+v[N][l].y){
                dis[B][v[N][l].x]=D+v[N][l].y;
                q.push(mp(mp(-D-v[N][l].y, B), v[N][l].x));
            }
        }
    }
    return 0;
}

Compilation message (stderr)

cities.cpp: In function 'int main()':
cities.cpp:18:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define fox(k, x) for (int k=0; k<x; ++k)
                                  ^
cities.cpp:62:9: note: in expansion of macro 'fox'
         fox(l, v[N].size()){
         ^
cities.cpp:33:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%i%i%i", &n, &k, &m);
                                ^
cities.cpp:38:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i", &a);
                        ^
cities.cpp:43:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%i%i%i", &a, &b, &c);
                                    ^

• Subtask 1: 22 / 22
• Subtask 2: 14 / 14
• Subtask 3: 15 / 15
• Subtask 4: 23 / 23
• Subtask 5: 0 / 26