제출 #361511

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
361511		cpp219	Cities (BOI16_cities)	C++14	0 / 100	780 ms	117064 KiB

cities

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 2e5 + 69;
const ll inf = 1e16 + 7;
typedef pair<ll,ll> LL;
vector<LL> g[N];
ll n,k,m,a[N],c,x,y,D[50][N],d[N],dp[N],ans = inf;
ll b[N];
void Dij(ll scr){
    set<LL> s; fill(d,d + n + 1,inf);
    s.insert({0,a[scr]}); d[a[scr]] = 0;
    while(!s.empty()){
        LL t = *s.begin(); s.erase(s.begin());
        ll u = t.sc;
        for (auto i : g[u]){
            ll v = i.fs,L = i.sc;
            if (d[v] > d[u] + L){
                s.erase({d[v],v}); d[v] = d[u] + L;
                s.insert({d[v],v});
            }
        }
    }
    for (ll i = 1;i <= n;i++) D[scr][i] = d[i];
}

bool chkbit(ll x,ll i){
    return (x >> i) & 1;
}

bool chkmask(ll mask,ll now){
    ll p = mask & now;
    return !p;
}

ll cal(ll mask,ll ver){
    ll res = 0;
    for (ll i = 1;i <= k;i++) if (chkbit(mask,i - 1)) res += D[i][ver];
    return res;
}

ll f(ll mask){
    //cout<<mask<<"\n";
    if (mask == (1 << k) - 1) return 0;
    if (dp[mask] != -1) return dp[mask];
    ll kq = inf;
    for (ll i = 0;i < k;i++){
        if (chkbit(mask,i)){
            for (ll j = 1;j <= n;j++){
                for (ll l = 1;l <= (1 << k) - 1;l++){
                    if (chkmask(mask,l)){
                        kq = min(kq,cal(l,j) + D[i + 1][j] + f(mask | l));
                    }
                }
            }
        }
    }
    return dp[mask] = kq;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    cin>>n>>k>>m;
    for (ll i = 1;i <= k;i++) cin>>a[i];
    while(m--){
        cin>>x>>y>>c;
        g[x].push_back({y,c}); g[y].push_back({x,c});
    }
    for (ll i = 1;i <= n;i++) Dij(i); memset(dp,-1,sizeof(dp));
    cout<<f(1);

}

컴파일 시 표준 에러 (stderr) 메시지

cities.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
cities.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      | 
cities.cpp: In function 'int main()':
cities.cpp:82:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   82 |     for (ll i = 1;i <= n;i++) Dij(i); memset(dp,-1,sizeof(dp));
      |     ^~~
cities.cpp:82:39: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   82 |     for (ll i = 1;i <= n;i++) Dij(i); memset(dp,-1,sizeof(dp));
      |                                       ^~~~~~
cities.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   73 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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