Submission #424958

#	Time	Username	Problem	Language	Result	Execution time	Memory
424958		SAAD	Bridges (APIO19_bridges)	C++17	13 / 100	81 ms	716 KiB

bridges

#define F first
#define S second
#define rep(i,a,b) for(int i=a;!(a==b&&i!=b)&&((i<=b&&b>=a)||(i>=b&&a>=b));i+=(a<=b?1:-1))
#define pb push_back
#define Fbitl __builtin_ffs
#define bit1 __builtin_popcount
#define pi acos(-1)
//#include <bits/stdc++.h>
#include <iostream>
#include <math.h>
#include <algorithm>
#include <string.h>
#include <vector>
#include <queue>
#include <map>
#include <unordered_map>

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<string, string> pss;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<vl> vvl;
struct path {
    int u;
    int w;
    int num;
};
bool visa[1002];
vector <path> x[1002];
pair<int, int> b[1002];
int dfs(int idx, int w) {
    visa[idx] = false;
    int res = 0;
    for (auto i : x[idx]) {
        if (visa[i.u] && w <= i.w) {
            res += dfs(i.u, w) + 1;
        }
    }
    return res;
}
int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    memset(visa, 1, sizeof(visa));
    int n, m, q, a, l, r, w;
    cin >> n >> m;
    for (int i = 1; i <= m; i++) {
        cin >> l >> r >> w;
        b[i] = { l,r };
        path z;
        z.u = l; z.w = w; z.num = i;
        x[r].pb(z);
        swap(z.u, r);
        x[r].pb(z);
    }
    cin >> q;
    vi ans;
    while (q--) {
        cin >> a;
        if (a == 1) {
            cin >> a >> w;
            for (int i = 0; i < x[b[a].F].size();i++) {
                if (x[b[a].F][i].num == a) x[b[a].F][i].w = w;
            }
            swap(b[a].F, b[a].S);
            for (int i = 0; i < x[b[a].F].size(); i++) {
                if (x[b[a].F][i].num == a) x[b[a].F][i].w = w;
            }
        }
        else {
            memset(visa, 1, sizeof(visa));
            cin >> a >> w;
            ans.push_back(dfs(a, w) + 1);
        }
    }
    for (auto i : ans)cout << i << endl;
    return 0;
}

Compilation message (stderr)

bridges.cpp: In function 'int main()':
bridges.cpp:66:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<path>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |             for (int i = 0; i < x[b[a].F].size();i++) {
      |                             ~~^~~~~~~~~~~~~~~~~~
bridges.cpp:70:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<path>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |             for (int i = 0; i < x[b[a].F].size(); i++) {
      |                             ~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 14
• Subtask 5: 0 / 13
• Subtask 6: 0 / 27