hihocoder-Weekly228-Parentheses Matching安全
Given a string of balanced parentheses output all the matching pairs.優化
A string consisting of only parentheses '(' and ')'. The parentheses are balanced and the length of the string is no more than 100000.spa
For each pair of matched parentheses output their positions in the string.code
(())()()
1 4 2 3 5 6 7 8
題解:blog
須要注意的是: 若是在循環中使用 strlen(ch) 來判斷長度,會致使TLE,多是有些編譯器對這方面的優化不夠。內存
更多的是: strlen(ch) 放在循環中也是一個很差的習慣,也是不安全的。 編譯器
#include <cstdio> #include <cstdlib> #include <cstring> const int MAXN = 100000 + 10; int main(){ char ch[MAXN]; int top = 0; int stk[MAXN]; int map[MAXN]; scanf("%s", ch); int len = strlen(ch); for(int i=0; i<len; ++i) { if(ch[i] == '(') { stk[top++] = i; } else if(ch[i] == ')') { --top; map[stk[top]] = i; } } for(int i=0; i<len; ++i) { if(ch[i] == '(') { printf("%d %d\n", i + 1, map[i] + 1); } } return 0; }