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HDU 5907 Find Q (水题)

题意:在他眼前有一个小写字母组成的字符串SSS,他想找出SSS的所有仅包含字母‘q‘的连续子串。

析:这个题,很容易发现,有 n 个连续个q,就是前 n 项和。注意不要超 int。

代码如下:

#pragma comment(linker, "/STACK:1024000000,1024000000")#include <cstdio>#include <string>#include <cstdlib>#include <cmath>#include <iostream>#include <cstring>#include <set>#include <queue>#include <algorithm>#include <vector>#include <map>#include <cctype>#include <cmath>#include <stack>//#include <tr1/unordered_map>#define freopenr freopen("in.txt", "r", stdin)#define freopenw freopen("out.txt", "w", stdout)using namespace std;//using namespace std :: tr1;typedef long long LL;typedef pair<int, int> P;const int INF = 0x3f3f3f3f;const double inf = 0x3f3f3f3f3f3f;const LL LNF = 0x3f3f3f3f3f3f;const double PI = acos(-1.0);const double eps = 1e-8;const int maxn = 1e5 + 5;const LL mod = 10000000000007;const int N = 1e6 + 5;const int dr[] = {-1, 0, 1, 0, 1, 1, -1, -1};const int dc[] = {0, 1, 0, -1, 1, -1, 1, -1};const char *Hex[] = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"};inline LL gcd(LL a, LL b){  return b == 0 ? a : gcd(b, a%b); }int n, m;const int mon[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};const int monn[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};inline int Min(int a, int b){ return a < b ? a : b; }inline int Max(int a, int b){ return a > b ? a : b; }inline LL Min(LL a, LL b){ return a < b ? a : b; }inline LL Max(LL a, LL b){ return a > b ? a : b; }inline bool is_in(int r, int c){    return r >= 0 && r < n && c >= 0 && c < m;}char s[maxn];LL sum[maxn];int main(){    sum[0] = 0;    for(int i = 1; i <= 100002; ++i)  sum[i] = sum[i-1] + i;    int T;  cin >> T;    while(T--){        scanf("%s", s);        n = strlen(s);        LL ans = 0;        int cnt = 0;        for(int i = 0; i < n; ++i){            if(s[i] == ‘q‘) ++cnt;            else if(cnt){                ans += sum[cnt];                cnt = 0;            }        }        ans += sum[cnt];        cout << ans << endl;    }    return 0;}

 

HDU 5907 Find Q (水题)