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답안 #273975

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
273975 2020-08-19T08:03:24 Z 반딧불(#5107) Mountains and Valleys (CCO20_day1problem3) C++17
2 / 25
 18 ms 12800 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int n, m;
vector<pair<int, int> > link[500002];
int depth[500002];
bool used[2000002];

int edgeX[2000002], edgeY[2000002], edgeZ[2000002];
int ans = INT_MAX, maX, root;
int lengthSum;

void dfs(int x, int par = -1){
    if(par==-1) root = x;
    for(auto &y: link[x]){
        if(y.first != par && used[y.second] && y.first != root && depth[y.first]==0){
            depth[y.first] = depth[x] + edgeZ[y.second];
            dfs(y.first, x);
        }
    }
}

void calc(){
    for(int k=0; k<n; k++) depth[k] = 0;
    dfs(0);
    maX = max_element(depth, depth+n) - depth;
    for(int k=1; k<n; k++){
        if(depth[k]==0) return;
        depth[k] = 0;
    }
    dfs(maX);
    ans = min(ans, 2*lengthSum-*max_element(depth, depth+n));
}

int main(){
    scanf("%d %d", &n, &m);
    for(int i=1; i<=m; i++){
        int x, y, w;
        scanf("%d %d %d", &x, &y, &w);
        link[x].push_back({y, i}), link[y].push_back({x, i});
        edgeX[i] = x, edgeY[i] = y, edgeZ[i] = w;

        if(edgeZ[i] == 1) used[i] = 1, lengthSum++;
    }

//    for(int i=1; i<=m; i++){
//        if(edgeZ[i] == 1) continue;
//        used[i] = 1, lengthSum+=edgeZ[i];
//        for(int j=1; j<=m; j++){
//            if(edgeZ[j] != 1) continue;
//            used[j] = 0;
//            lengthSum--;
//            calc();
//            used[j] = 1, lengthSum++;
//        }
//        used[i] = 0, lengthSum-=edgeZ[i];
//    }
    calc();

    printf("%d", ans);
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |         scanf("%d %d %d", &x, &y, &w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #2
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #3
2.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 12800 KB Output is correct
2 Correct 15 ms 12800 KB Output is correct
3 Correct 15 ms 12672 KB Output is correct
4 Correct 14 ms 12672 KB Output is correct
5 Correct 16 ms 12672 KB Output is correct
6 Correct 15 ms 12544 KB Output is correct
7 Correct 14 ms 12800 KB Output is correct
8 Correct 14 ms 12672 KB Output is correct
9 Correct 17 ms 12672 KB Output is correct
10 Correct 14 ms 12672 KB Output is correct
11 Correct 15 ms 12672 KB Output is correct
12 Correct 15 ms 12672 KB Output is correct
13 Correct 16 ms 12672 KB Output is correct
14 Correct 18 ms 12672 KB Output is correct

Subtask #4
0.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0.0 / 2.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0.0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #7
0.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #8
0.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 12032 KB Output is correct
2 Correct 11 ms 12032 KB Output is correct
3 Correct 9 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 10 ms 12032 KB Output is correct
6 Correct 10 ms 12032 KB Output is correct
7 Correct 9 ms 12032 KB Output is correct
8 Correct 10 ms 12032 KB Output is correct
9 Correct 10 ms 12032 KB Output is correct
10 Correct 9 ms 12032 KB Output is correct
11 Incorrect 11 ms 12032 KB Output isn't correct
12 Halted 0 ms 0 KB -