Submission #791326

#	Time	Username	Problem	Language	Result	Execution time	Memory
791326		Username4132	Šarenlist (COCI22_sarenlist)	C++14	110 / 110	2 ms	4692 KiB

Main

#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
using pii = pair<int, int>;
using ll = long long;
#define forn(i, n) for(int i=0; i<(int)n; ++i)
#define forsn(i, s, n) for(int i=s; i<(int)n; ++i)
#define PB push_back
#define F first
#define S second

const int PO = 1<<15, MOD = 1000000007;
ll bit[16];
int n, m, k;
pii par[62];
vector<pii> g[62];
int siz[PO];
ll cmp[PO][16], res[PO], pot[62];

void dfs(int v, int p){
    for(pii to:g[v]) if(to.F!=p){
        par[to.F]={v, to.S};
        dfs(to.F, v);
    }
}

int main(){
    scanf("%d %d %d", &n, &m, &k);
    forn(i, n-1){
        int a, b; scanf("%d %d", &a, &b); --a, --b;
        g[a].PB({b, i}), g[b].PB({a, i});
    }
    forn(i, m){
        int a, b; scanf("%d %d", &a, &b); --a, --b;
        dfs(a, a);
        while(b!=a){
            bit[i]|=(1LL << (par[b].S));
            b=par[b].F;
        }
    }
    pot[0]=1;
    forn(i, n) pot[i+1]=(pot[i]*k)%MOD;
    ll ans=pot[n-1];
    forsn(mask, 1, (1<<m)){
        int ind = __builtin_ctz(mask);
        int pr = mask - (1 << ind);
        ll ed = bit[ind], cur = ed;
        res[mask] = res[pr] | ed;
        forn(i, siz[pr]){
            if(cmp[pr][i] & ed) cur|=cmp[pr][i];
            else cmp[mask][siz[mask]++]=cmp[pr][i];
        }
        cmp[mask][siz[mask]++]=cur;
        int choice = siz[mask] + (n-1-__builtin_popcountll(res[mask]));
        int add = (__builtin_popcount(mask)&1)? -pot[choice] : pot[choice];
        ans = (ans + add + MOD)%MOD;
    }
    printf("%lld\n", ans);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:29:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     scanf("%d %d %d", &n, &m, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:31:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         int a, b; scanf("%d %d", &a, &b); --a, --b;
      |                   ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:35:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         int a, b; scanf("%d %d", &a, &b); --a, --b;
      |                   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 65 / 65