oj.uz

답안 #156116

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
156116 2019-10-03T14:41:42 Z Flying_dragon_02 우호 조약 체결 (JOI14_friends) C++14
0 / 100
 121 ms 15180 KB 
#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define pb push_back
#define mp make_pair

typedef pair<int, int> ii;

const int mod = 1e9 + 7;

const int inf = 1e9;

int add(int x, int y) {
    return (1ll * x + 1ll * y) % mod;
}

int del(int x, int y) {
    return ((1ll * x - 1ll * y) % mod + mod) % mod;
}

int mul(int x, int y) {
    return (1ll * x * 1ll * y) % mod;
}

const int N = 2e5 + 5;

int n, m, pSet[N], sz[N];

vector<int> graph[N];

int findSet(int u) {
    //cout << u << "\n";
    if(u == pSet[u]) return u;
    else return pSet[u] = findSet(pSet[u]);
}

void unionSet(int u, int v) {
    u = findSet(u), v = findSet(v);
    if(u == v) return ;
    sz[v] += sz[u];
    pSet[u] = v;
}

bool vis[N];

vector<int> vec, gr[N];

void dfs(int u) {
    vis[u] = 1;
    vec.pb(u);
    for(int i = 0; i < graph[u].size(); i++) {
        int v = graph[u][i];
        if(!vis[v])
            dfs(v);
    }
}

int main() {
    cin.tie(0), ios_base::sync_with_stdio(0);
   // freopen("test.inp", "r", stdin);
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
        pSet[i] = i, sz[i] = 1;
    for(int i = 1; i <= m; i++) {
        int u, v;
        cin >> u >> v;
        graph[u].pb(v);
    }
    for(int i = 1; i <= n; i++) {
        if(graph[i].size() >= 2) {
            for(int j = 0; j < graph[i].size() - 1; j++)
                unionSet(graph[i][j], graph[i][j + 1]);
        }
    }
   /* for(int i = 1; i <= n; i++) {
        for(int j = 0; j < graph[i].size(); j++) {
            int v = graph[i][j];
            if(findSet(i) != findSet(v))
                gr[findSet(i)].pb(findSet(v));
        }
    }
    for(int i = 1; i <= n; i++) {
        graph[i] = gr[i];
        gr[i].clear();
    }*/
    for(int i = 1; i <= n; i++) {
        if(!vis[i] && sz[findSet(i)] >= 2) {
            vec.clear();
            dfs(i);
            for(int j = 0; j < vec.size() - 1; j++)
                unionSet(vec[j], vec[j + 1]);
        }
    }
    for(int i = 1; i <= n; i++) {
        for(int j = 0; j < graph[i].size(); j++) {
            int v = graph[i][j];
            if(findSet(i) != findSet(v))
                gr[findSet(i)].pb(findSet(v));
        }
    }
    for(int i = 1; i <= n; i++)
        graph[i] = gr[i];
    memset(vis, 0, sizeof(vis));
    long long total = 0;
    for(int i = 1; i <= n; i++) {
        if(!vis[findSet(i)]) {
            vis[findSet(i)] = 1;
            if(sz[findSet(i)] >= 2)
                total += 1ll * sz[findSet(i)] * (sz[findSet(i)] - 1);
            else
                total += graph[findSet(i)].size();
        }
    }
    cout << total;
}

Compilation message

friends.cpp: In function 'void dfs(int)':
friends.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < graph[u].size(); i++) {
                    ~~^~~~~~~~~~~~~~~~~
friends.cpp: In function 'int main()':
friends.cpp:74:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < graph[i].size() - 1; j++)
                            ~~^~~~~~~~~~~~~~~~~~~~~
friends.cpp:93:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < vec.size() - 1; j++)
                            ~~^~~~~~~~~~~~~~~~
friends.cpp:98:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j = 0; j < graph[i].size(); j++) {
                        ~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 9852 KB Output is correct
2 Correct 11 ms 9944 KB Output is correct
3 Correct 10 ms 9976 KB Output is correct
4 Correct 10 ms 9976 KB Output is correct
5 Correct 10 ms 9880 KB Output is correct
6 Correct 11 ms 9912 KB Output is correct
7 Correct 11 ms 9976 KB Output is correct
8 Correct 11 ms 9976 KB Output is correct
9 Correct 13 ms 9976 KB Output is correct
10 Correct 11 ms 9976 KB Output is correct
11 Correct 11 ms 9976 KB Output is correct
12 Correct 11 ms 9976 KB Output is correct
13 Correct 11 ms 9976 KB Output is correct
14 Correct 11 ms 9976 KB Output is correct
15 Correct 10 ms 9976 KB Output is correct
16 Incorrect 11 ms 9976 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 13 ms 10104 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 65.0

# 결과 실행 시간 메모리 Grader output
1 Correct 60 ms 11172 KB Output is correct
2 Incorrect 121 ms 15180 KB Output isn't correct
3 Halted 0 ms 0 KB -