#include <bits/stdc++.h>
using namespace std;
const int N = (int)1e5 + 7;
vector <int> gr[N];
int n, m;
vector <tuple<int, int, int>> vec;
int tin[N], tout[N], lc[17][N];
int tiktak;
void dfs(int v, int pr) {
tin[v] = ++tiktak;
lc[0][v] = pr;
for (int i = 1; i < 17; i++) {
lc[i][v] = lc[i - 1][lc[i - 1][v]];
}
for (int to : gr[v]) {
if (to == pr) continue;
dfs(to, v);
}
tout[v] = ++tiktak;
}
bool upper(int a, int b) {
return tin[a] <= tin[b] && tout[a] >= tout[b];
}
int lca(int a, int b) {
if (upper(a, b)) return a;
if (upper(b, a)) return b;
for (int i = 16; i >= 0; i--) {
if (!upper(lc[i][a], b)) a = lc[i][a];
}
return lc[0][a];
}
bool check(int i, int j) {
int a, b, c, d, val = 0;
tie(a, b) = make_tuple(get<0>(vec[i]), get<1>(vec[i]));
tie(c, d) = make_tuple(get<0>(vec[j]), get<1>(vec[j]));
int lc = lca(c, d);
if (upper(a, b)) {
val = (tin[a] <= tin[c] && tin[c] <= tin[b]);
val ^= (tin[a] <= tout[c] && tout[c] <= tin[b]);
if (val) return 0;
val = (tin[a] <= tin[d] && tin[d] <= tin[b]);
val ^= (tin[a] <= tout[d] && tout[d] <= tin[b]);
if (val) return 0;
val = (tin[a] <= tin[lc] && tin[lc] <= tin[b]);
val ^= (tin[a] <= tout[lc] && tout[lc] <= tin[b]);
if (val) return 0;
} else {
val = (tout[a] <= tin[c] && tin[c] <= tin[b]);
val ^= (tout[a] <= tout[c] && tout[c] <= tin[b]);
if (val) return 0;
val = (tout[a] <= tin[d] && tin[d] <= tin[b]);
val ^= (tout[a] <= tout[d] && tout[d] <= tin[b]);
if (val) return 0;
val = (tout[a] <= tin[lc] && tin[lc] <= tin[b]);
val ^= (tout[a] <= tout[lc] && tout[lc] <= tin[b]);
if (val) return 0;
int lc1 = lca(a, b);
if (lc1 == a || lc1 == b || lc1 == lc) return 0;
}
return 1;
}
int ans;
int solve1() {
for (int mask = 1; mask < (1 << m); mask++) {
vector <int> v;
for (int j = 0; j < m; j++) {
if ((mask >> j) & 1) {
v.push_back(j);
}
}
bool ok = 1;
for (int i = 0; i < v.size(); i++) {
for (int j = 0; j < v.size(); j++) {
if (i == j) continue;
ok &= check(v[i], v[j]);
}
}
if (ok) {
int res = 0;
for (int &to : v) {
res += get<2>(vec[to]);
}
ans = max(ans, res);
}
}
return ans;
}
int dp[N];
main() {
scanf("%d", &n);
for (int i = 1; i < n; i++) {
int u, v;
scanf("%d %d", &u, &v);
gr[u].push_back(v);
gr[v].push_back(u);
}
dfs(1, 1);
scanf("%d", &m);
for (int i = 0; i < m; i++) {
int u, v, w;
scanf("%d %d %d", &u, &v, &w);
if (tin[u] > tin[v]) swap(u, v);
vec.push_back({u, v, w});
}
if (m <= 15) {
return solve1();
}
sort(vec.begin(), vec.end());
int ptr = vec.size() - 1;
for (int i = n; i >= 1; i--) {
dp[i] = dp[i + 1];
while (ptr >= 0 && get<0>(vec[ptr]) == i) {
dp[i] = max(dp[i], dp[get<1>(vec[ptr]) + 1] + get<2>(vec[ptr]));
ptr--;
}
}
printf("%d\n", dp[1]);
}
Compilation message
election_campaign.cpp: In function 'int solve1()':
election_campaign.cpp:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < v.size(); i++) {
~~^~~~~~~~~~
election_campaign.cpp:82:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int j = 0; j < v.size(); j++) {
~~^~~~~~~~~~
election_campaign.cpp: At global scope:
election_campaign.cpp:100:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main() {
^
election_campaign.cpp: In function 'int main()':
election_campaign.cpp:101:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
~~~~~^~~~~~~~~~
election_campaign.cpp:104:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &u, &v);
~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:109:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &m);
~~~~~^~~~~~~~~~
election_campaign.cpp:112:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d", &u, &v, &w);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2808 KB |
Execution failed because the return code was nonzero |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2808 KB |
Execution failed because the return code was nonzero |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2808 KB |
Execution failed because the return code was nonzero |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
149 ms |
15280 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2808 KB |
Execution failed because the return code was nonzero |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
4 ms |
2808 KB |
Execution failed because the return code was nonzero |
| 2 |
Halted |
0 ms |
0 KB |
- |
