#include <bits/stdc++.h>
using namespace std;
#define fori(i,n) for(int i = 0; i < (n);i++)
#define fora(i,a,n) for(int i = (a); i <= (n);i++)
#define MAX_N 2000005
const int INF = 1e9 + 7;
#define fill(a, v) memset(a, (long long)v, sizeof(a))
#define oper max
#define int long long
int sgt[4*(MAX_N)];
int n,q,nn;
void build(int v, int tl, int tr){
if(tl == tr){
sgt[v] = INF;
}else{
int tm = (tl+tr)/2;
build(v*2, tl, tm);
build(v*2+1, tm + 1, tr);
sgt[v] = min(sgt[v*2], sgt[v*2+1]);
}
}
void update(int v, int tl, int tr, int pos, int new_value){
if(tl == tr){
sgt[v] = new_value;
}else{
int tm = (tl+tr)/2;
if(pos <= tm){
update(v*2, tl, tm, pos, new_value);
}else{
update(v*2+1, tm+1, tr, pos, new_value);
}
sgt[v] = min(sgt[v*2], sgt[v*2+1]);
}
}
int query(int v, int tl , int tr, int l, int r){
if(l > r){
return INF;
}
if( l == tl && r == tr){
return sgt[v];
}else{
int tm = (tl+tr)/2;
int leftAns = query(2*v, tl, tm, l, min(tm, r));
int rightAns = query(2*v + 1, tm+1, tr, max(l, tm+1), r);
return min(leftAns, rightAns);
}
}
signed main(){
cin >> n >> q;
build(1,0,n-1);
while(q--){
char id;
cin >> id;
if(id == 'M'){
int a, x;
cin >> x >> a;
update(1, 0, n-1,a-1, x);
}else{
int b, y;
cin >> y >> b;
int l = b - 1, r = n - 1, ans = n + 1;
while(l <= r){
int child = (l+r)/2;
int min_stop = query(1,0,n-1,l,child);
if(min_stop <= y){
ans = min(ans,child);
r = child - 1;
}else{
l = child + 1;
}
}
if(ans == n + 1)
cout << "-1\n";
else
cout << ans + 1 << "\n";
}
}
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
10 ms |
516 KB |
Output is correct |
| 4 |
Correct |
931 ms |
8620 KB |
Output is correct |
| 5 |
Correct |
651 ms |
6144 KB |
Output is correct |
| 6 |
Correct |
729 ms |
8396 KB |
Output is correct |
| 7 |
Correct |
814 ms |
8524 KB |
Output is correct |
