#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
using d64 = long double;
using pi = pair<int, int>;
using pli = pair<i64, i64>;
using ti = tuple<int, int, int>;
using tli = tuple<i64, i64, i64>;
vector<pli> adj[300001];
const i64 inf = numeric_limits<i64>::max() / 3;
inline i64 ab(i64 x) { return x > 0 ? x : -x; }
class slope {
public:
priority_queue<i64> bp;
i64 sac, fz;
slope() {
sac = 0;
fz = 0;
}
void push(i64 x) {
fz += x;
if (bp.empty()) {
bp.push(x);
bp.push(x);
++sac;
return;
}
while (bp.size() > sac + 1) bp.pop();
auto m1 = bp.top();
bp.pop();
auto m2 = bp.top();
bp.pop();
bp.push(m1 + x);
bp.push(m2 + x);
}
};
void mer(slope* s1, slope* s2) {
s1->fz += s2->fz;
s1->sac += s2->sac;
while (!s2->bp.empty()) s1->bp.push(s2->bp.top()), s2->bp.pop();
delete s2;
}
slope* solve(int h, int p = -1) {
slope* ret = new slope();
for (auto [t, wf] : adj[h]) {
if (t == p) continue;
auto chslp = solve(t, h);
chslp->push(wf);
mer(ret, chslp);
}
return ret;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int N, M;
cin >> N >> M;
for (int i = 2; i <= N + M; i++) {
i64 j, w;
cin >> j >> w;
adj[i].emplace_back(j, w);
adj[j].emplace_back(i, w);
}
auto res = *solve(1);
vector<i64> bp;
while (!res.bp.empty()) bp.emplace_back(res.bp.top()), res.bp.pop();
reverse(iterall(bp));
for (int i = 0; i < res.sac; i++) res.fz -= bp[i];
cout << res.fz << '\n';
}
Compilation message
fireworks.cpp: In member function 'void slope::push(i64)':
fireworks.cpp:37:26: warning: comparison of integer expressions of different signedness: 'std::priority_queue<long long int>::size_type' {aka 'long unsigned int'} and 'i64' {aka 'long long int'} [-Wsign-compare]
37 | while (bp.size() > sac + 1) bp.pop();
| ~~~~~~~~~~^~~~~~~~~
fireworks.cpp: In function 'int main()':
fireworks.cpp:79:13: error: 'iterall' was not declared in this scope; did you mean 'ftell'?
79 | reverse(iterall(bp));
| ^~~~~~~
| ftell
