#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define mk make_pair
#define F first
#define S second
int n, m, flag = true;
vector < int > u, v, w;
vector < int > vc[200045];
pair < int , pair< int, int > > p[200045];
int parent[200045];
int get( ll x ){
if( parent[x] == x )
return x;
parent[x] = get( parent[x] );
}
void init(int N, int M,
std::vector<int> U, std::vector<int> V, std::vector<int> W) {
int i;
n = N;m = M;u = U;v = V;w = W;
for( i = 0; i < m; i ++ ){
p[i].second.F=u[i];
p[i].second.S=v[i];
p[i].first=w[i];
}
sort( p, p + m );
for( i = 1; i <= n; i ++ ){
parent[i] = i;
}
}
int getMinimumFuelCapacity(int X, int Y) {
map < int, int > mp;
int i;
flag = false;
mp.clear();
for( i = 0; i < n; i ++ )
vc[i].clear();
for( i = 0; i < m; i ++ ){
int x = get( p[i].second.F );
int y = get( p[i].second.S );
if( x != y ){
if( sz[x] < sz[y] )
swap( x, y );
parent[y] = x;
}
vc[ p[i].second.F ].pb( p[i].second.S );
vc[ p[i].second.S ].pb( p[i].second.F );
mp[p[i].second.F] = 1;
mp[ p[i].second.S ] = 1;
if( vc[ p[i].S.F ].size() == 3 || vc[p[i].S.S].size() == 3 ){
flag = true;
}
if( mp.size() == i+1 && mp[X] == mp[Y] && mp[X] == 1 && parent[x] == parent[y] ){
return p[i].first;
}
if( mp[X] == mp[Y] && mp[X] == 1 && flag == true && parent[x] == parent[y] )
return p[i].first;
}
return -1;
}
int main() {
int N, M;
assert(2 == scanf("%d %d", &N, &M));
std::vector<int> U(M), V(M), W(M);
for (int i = 0; i < M; ++i) {
assert(3 == scanf("%d %d %d", &U[i], &V[i], &W[i]));
}
int Q;
assert(1 == scanf("%d", &Q));
std::vector<int> X(Q), Y(Q);
for (int i = 0; i < Q; ++i) {
assert(2 == scanf("%d %d", &X[i], &Y[i]));
}
init(N, M, U, V, W);
std::vector<int> minimum_fuel_capacities(Q);
for (int i = 0; i < Q; ++i) {
minimum_fuel_capacities[i] = getMinimumFuelCapacity(X[i], Y[i]);
}
for (int i = 0; i < Q; ++i) {
printf("%d\n", minimum_fuel_capacities[i]);
}
return 0;
}
Compilation message
swap.cpp: In function 'int getMinimumFuelCapacity(int, int)':
swap.cpp:43:8: error: 'sz' was not declared in this scope
43 | if( sz[x] < sz[y] )
| ^~
swap.cpp:54:17: warning: comparison of integer expressions of different signedness: 'std::map<int, int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
54 | if( mp.size() == i+1 && mp[X] == mp[Y] && mp[X] == 1 && parent[x] == parent[y] ){
| ~~~~~~~~~~^~~~~~
swap.cpp: In function 'int get(long long int)':
swap.cpp:16:12: warning: control reaches end of non-void function [-Wreturn-type]
16 | parent[x] = get( parent[x] );
| ~~~~~~~~~~^~~~~~~~~~~~~~~~~~
