이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
#define pb push_back
using namespace std;
const int N = 5e4+5;
struct bridge{
int a,b,val;
bridge(){
a = b = val = 0;
}
};
int n,m,q;
bool vis[N];
vector<bridge> e;
vector< pair<int,int> > adj[N];
int dfs(int v,int val) {
int cnt = 1;
vis[v] = 1;
for (auto i : adj[v]) {
if (i.second >= val && !vis[i.first])
cnt += dfs(i.first,val);
}
return cnt;
}
int arr[100009],t[400009];
void build(int v,int tl,int tr) {
if (tl == tr) {
t[v] = arr[tl];
return;
}
int tm = (tl + tr)/2;
build(v*2,tl,tm);
build(v*2|1,tm+1,tr);
t[v] = min(t[v*2],t[v*2+1]);
}
void upd(int v,int tl,int tr,int pos,int val) {
if (tl == tr) {
t[v] = arr[tl] = val;
return;
}
int tm = (tl + tr)/2;
if (pos <= tm)
upd(v*2,tl,tm,pos,val);
else
upd(v*2|1,tm+1,tr,pos,val);
t[v] = min(t[v*2],t[v*2+1]);
}
int get(int v,int tl,int tr,int l,int r) {
if (l > tr || r < tl) return INT_MAX;
if (l <= tl && r >= tr) return t[v];
int tm = (tl + tr)/2;
return min( get(v*2,tl,tm,l,r),
get(v*2|1,tm+1,tr,l,r));
}
void LINE() {
for (int i = 1; i <= m; i++) {
arr[i] = e[i].val;
}
build(1,1,m);
for (int type,x,y;q--;) {
cin >> type >> x >> y;
if (type == 1) {
upd(1,1,m,x,y);
}
else {
int lo = x, hi = m;
while (lo < hi) {
int mid = (lo + hi + 1)/2;
if (get(1,1,m,x,mid) >= y)
lo = mid;
else hi = mid-1;
}
int ans = 1;
if (x != n && get(1,1,m,lo,lo) < y) lo--;
if (x != n) ans = lo + 1 - x;
lo = 1, hi = x-1;
if (x != 1) {
while (lo < hi) {
int mid = (lo + hi)/2;
if (get(1,1,m,mid,x-1) >= y)
hi = mid;
else lo = mid+1;
}
if (hi == 0 || get(1,1,m,hi,x-1) < y) hi++;
ans += x - hi;
}
cout << ans <<'\n';
}
}
exit(0);
}
main() {
cin >> n >> m;
e.resize(m+1);
bool fl1 = (m == n-1);
for (int i = 1; i <= m; i++) {
cin >> e[i].a >> e[i].b >> e[i].val;
if (e[i].a != i || e[i].b != i+1)
fl1 = 0;
adj[e[i].a].pb({e[i].b,e[i].val});
adj[e[i].b].pb({e[i].a,e[i].val});
}
cin >> q;
if (fl1 && n > 1) {
LINE();
}
for (int type,x,y;q--;) {
cin >> type >> x >> y;
if (type == 1) {
int a = e[x].a, b = e[x].b,val = e[x].val;
adj[a].erase(find(adj[a].begin(),adj[a].end(),make_pair(b,val)));
adj[b].erase(find(adj[b].begin(),adj[b].end(),make_pair(a,val)));
e[x].val = y;
adj[a].pb({b,y});
adj[b].pb({a,y});
}
else {
cout << dfs(x,y) <<'\n';
fill(vis,vis+n+1,0);
}
}
}
컴파일 시 표준 에러 (stderr) 메시지
bridges.cpp:94:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main() {
^
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