Submission #888336

#	Time	Username	Problem	Language	Result	Execution time	Memory
888336		1075508020060209tc	Paths (BOI18_paths)	C++14	70 / 100	364 ms	64184 KiB

paths

#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;
#define int long long
//const int mod=998244353;
int n;int m;int K;
int cr[500005];
int ar[500005];
int br[500005];
vector<int>e[500005];
int ans;

void solve2(){
for(int i=1;i<=m;i++){
    if(cr[ar[i]]!=cr[br[i]]){ans+=2;}
}
}

void solve3(){
int ret=0;
for(int nw=1;nw<=n;nw++){
    vector<int>tbl(10,0);
    for(int i=0;i<e[nw].size();i++){
        int v=e[nw][i];
        for(int j=1;j<=5;j++){
            if(j==cr[v]){continue;}
            if(j==cr[nw]){continue;}
            if(cr[v]==cr[nw]){continue;}
            ret+=tbl[j];
        }
        tbl[cr[v]]++;
    }
}
ret*=2;
ans+=ret;
}

void solve4(){
vector<vector<int>>tbl(n+10,vector<int>(6,0));
for(int nw=1;nw<=n;nw++){
    for(int i=0;i<e[nw].size();i++){
        int v=e[nw][i];
        if(cr[v]!=cr[nw]){
            tbl[nw][cr[v]]++;
        }
    }
}
for(int i=1;i<=m;i++){
    int a=ar[i];int b=br[i];
    for(int x=1;x<=5;x++){
        for(int y=1;y<=5;y++){
            if(x==cr[a]||y==cr[a]||x==cr[b]||y==cr[b]||x==y||cr[a]==cr[b]){continue;}
            ans+=tbl[a][x]*tbl[b][y]*2;
        }
    }

}


}

signed main(){
cin>>n>>m>>K;
for(int i=1;i<=n;i++){
    cin>>cr[i];
}
for(int i=1;i<=m;i++){
    cin>>ar[i]>>br[i];
    e[ar[i]].push_back(br[i]);
    e[br[i]].push_back(ar[i]);
}
ans=0;
solve2();
solve3();
//cout<<ans<<" ";
if(K>=4){solve4();}

cout<<ans<<"\n";


}

Compilation message (stderr)

paths.cpp: In function 'void solve3()':
paths.cpp:23:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i=0;i<e[nw].size();i++){
      |                 ~^~~~~~~~~~~~~
paths.cpp: In function 'void solve4()':
paths.cpp:41:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     for(int i=0;i<e[nw].size();i++){
      |                 ~^~~~~~~~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 0 / 30