제출 #79821

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
79821		pzdba	Deda (COCI17_deda)	C++14	120 / 140	1080 ms	17040 KiB

deda

#include <bits/stdc++.h>
using namespace std;
const int N = 200000;
int st[4*N+5];
void update(int n, int s, int e, int idx, int v){
	if(s == e){
		st[n] = v;
	}
	else{
		int mid = (s+e)/2;
		if(idx <= mid) update(n+n, s, mid, idx, v);
		else update(n+n+1, mid+1, e, idx, v);
		st[n] = min(st[n+n], st[n+n+1]);
	}
}
int query(int n, int s, int e, int l, int r){
	if(s > r || l > e) return 2e9;
	if(l <= s && e <= r) return st[n];
	int mid = (s+e)/2;
	int q1 = query(n+n, s, mid, l, r);
	int q2 = query(n+n+1, mid+1, e, l, r);
	return min(q1, q2);
}
int main(){
	int n, q;
	scanf("%d%d", &n, &q);
	for(int i=1;i<=n;i++) update(1, 1, n, i, 2e9);
	for(int i=1;i<=q;i++){
		char s[2];
		int x, a;
		scanf("%s%d%d", s, &x, &a);
		if(s[0] == 'M'){
			update(1, 1, n, a, x);
		}
		else{
			int y = x, b = a;
			int lo = b, hi = n, ans = -1;
			while(lo <= hi){
				int mid = (lo+hi)/2;
				if(query(1, 1, n, b, mid) <= y) ans = mid, hi = mid-1;
				else lo = mid+1;
			}
			printf("%d\n", ans);
		}
	}
}

컴파일 시 표준 에러 (stderr) 메시지

deda.cpp: In function 'int main()':
deda.cpp:26:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &q);
  ~~~~~^~~~~~~~~~~~~~~~
deda.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s%d%d", s, &x, &a);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 120 / 140