Submission #153157

#	Time	Username	Problem	Language	Result	Execution time	Memory
153157		Swan	Paths (BOI18_paths)	C++14	43 / 100	3031 ms	34168 KiB

paths

#include <bits/stdc++.h>
#define stop system("pause")
#define INP freopen("input.txt","r",stdin)
#define OUTP freopen("solve1.txt","w",stdout)
#define int long long
using namespace std;

typedef long long ll;

vector<vector<int> > v;
const int maxn = 4e5;
int color[maxn];
bool c_used[maxn];
bool used[maxn];
int cnt[maxn][5];
int n,m,k;

bool is_good(int mask,int x){
    return !(mask&(1<<x));
}

int ans = 0 ;

void dfs(int u,int mask){
    if(mask)ans++;
    mask|=(1<<color[u]);
    for(int i(0); i < v[u].size();i++){
        int to = v[u][i];
        if(!is_good(mask,color[to]))continue;
        dfs(to,mask);
    }
}

void solve_1(){
    int ans = 0;
    for(int i(0); i < n;i++){
        for(int j(0); j < v[i].size();j++){
            int to = v[i][j];
            ans++;
            for(int z(1); z <= 3;z++){
                if(z!=color[i]&&z!=color[to])ans+=cnt[to][z];
            }
        }
    }
    cout << ans;
    exit(0);
}

main()
{
    ios_base::sync_with_stdio(0);
    cin >> n >> m >> k;
    v.resize(n+2);
    for(int i(0); i < n;i++)cin >> color[i];
    for(int i(0); i < m;i++){
        int a,b; cin >> a >> b;
        a--;b--;
        if(color[a] == color[b])continue;
        cnt[a][color[b]]++;
        cnt[b][color[a]]++;
        //cout << "good " << a+1 << ' ' << b+1 << endl;
        v[a].push_back(b);
        v[b].push_back(a);
    }
    if(k == 3)solve_1();
    for(int i(0); i < n;i++){
        dfs(i,0);
    }
    cout << ans;
    return 0;
}
/*
*/

Compilation message (stderr)

paths.cpp: In function 'void dfs(long long int, long long int)':
paths.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i(0); i < v[u].size();i++){
                   ~~^~~~~~~~~~~~~
paths.cpp: In function 'void solve_1()':
paths.cpp:37:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j(0); j < v[i].size();j++){
                       ~~^~~~~~~~~~~~~
paths.cpp: At global scope:
paths.cpp:49:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^

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