By
yusijia
Updated:
题目大意:
输出有多少个括号是符合的,例如:
()()()
6
(()))
4
()[()
4
括号为:(,),[,]
- 补:另一个思路是,记录’(‘,’)’,’[‘,’]’的个数,然后从‘(’和‘)’的数目中选择最小的乘2,[和]类似
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| #include <cstdio> #include <iostream> #include <cstdlib> #include <cstring> #include <stack> #include <algorithm> using namespace std; #define MAXN 150
stack <char> sta; int dp[MAXN];
int main() { char str[150], flag; while(scanf("%s", str + 1) != EOF){ memset(dp, 0, sizeof(dp)); flag = 0; if(str[1] == 'e') break; int len = strlen(str); for(int i = 1; i < len; i++){ if(str[i] == '(' || str[i] == '['){ if(str[i] == '[') flag++; if(str[i] == '(') sta.push(str[i]); dp[i] = dp[i - 1]; continue; } if(str[i] == ')' && !sta.empty()){ dp[i] = dp[i - 1] + 2; sta.pop(); continue; } if(str[i] == ']' && flag){ flag--; dp[i] = dp[i - 1] + 2; } else dp[i] = dp[i - 1]; } printf("%d\n", dp[len - 1]); }
return 0; }
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