1140 : Parenthesis

时间限制Time Limit 1 秒Sec 内存限制Memory Limit 128 兆MB 提交次数Submitted 138 次Times 通过次数Solved 28 次Times

标准评测 Standard

从标准输入读入，结果写到标准输出。评测将输出拆成 token，与标准答案逐项比较，不按整段逐字节比对。 Read from standard input and write to standard output. The judge splits the output into tokens and compares them with the official answer; it does not compare raw bytes.

比对Compare	token 相同即通过。中间的空格、制表符、换行可多可少。Matching tokens pass. Extra spaces, tabs, or newlines between them are ignored.
不同则错Differs	token 个数或内容不同即错误。23 与 2 3、02 与 2、2.0 与 2 均视为不同。A different token count or value is wrong. 23 vs 2 3, 02 vs 2, and 2.0 vs 2 all differ.
输入Input	标准输入，格式见题面。Standard input; format as in the statement.
输出Output	标准输出。Standard output.

模板Template

C++ C Java Python

#include <iostream>
using namespace std;
int main() {
    int a, b;
    cin >> a >> b;
    cout << (a + b) << endl;
    return 0;
}

#include <stdio.h>
int main() {
    int a, b;
    scanf("%d%d", &a, &b);
    printf("%d\n", a + b);
    return 0;
}

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        System.out.println(a + b);
    }
}

a, b = map(int, input().split())
print(a + b)

题目描述Description

Bobo has a balanced parenthesis sequence P=p1 p2…pn of length n and q questions.

The i-th question is whether P remains balanced after p_ai and p_bi swapped. Note that questions are individual so that they have no affect on others.

Parenthesis sequence S is balanced if and only if:

S is empty;
or there exists balanced parenthesis sequence A,B such that S=AB;
or there exists balanced parenthesis sequence S’ such that S=(S’).

输入格式Input

The input contains at most 30 sets. For each set:

The first line contains two integers n,q (2 ≤ n ≤ 10⁵, 1 ≤ q ≤ 10⁵).

The second line contains n characters p1 p2…pn.

The i-th of the last q lines contains 2 integers ai,bi (1 ≤ ai, bi ≤ n, ai ≠ bi).

输出格式Output

For each question, output “Yes” if P remains balanced, or “No” otherwise.

CSGCPC

1140 : Parenthesis

题目描述Description

输入格式Input

输出格式Output

样例Sample

出题Author

来源Source