Codeforces Round #336 (Div. 2) 608B Hamming Distance Sum(dp)
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给出2个字符串a, b. 问字符串b中和字符串a长度相同的子串对应01不同的有多少对.
若a, b两字符串长度相同, 则直接比较. 若字符串长度不同, 记录当前位置以前所有的0, 1个数, 最后累加得到答案.
AC代码:
#include "iostream"#include "cstdio"#include "cstring"#include "algorithm"#include "queue"#include "stack"#include "cmath"#include "utility"#include "map"#include "set"#include "vector"#include "list"#include "string"#include "cstdlib"using namespace std;typedef long long ll;const int MOD = 1e9 + 7;const int INF = 0x3f3f3f3f;const int MAXN = 2e5 + 5;char a[MAXN], b[MAXN];ll ans, dp0[MAXN], dp1[MAXN];int main(int argc, char const *argv[]){scanf("%s%s", a + 1, b + 1);int len1 = strlen(a + 1), len2 = strlen(b + 1);if(len1 == len2) {for(int i = 1; i <= len1; ++i)if(a[i] != b[i]) ans++;}else {for(int i = len2; i >= 1; --i)if(b[i] == '0') {dp0[i] = dp0[i + 1] + 1;dp1[i] = dp1[i + 1];}else {dp1[i] = dp1[i + 1] + 1;dp0[i] = dp0[i + 1];}for(int i = 1; i <= len1; ++i)if(a[i] == '0') ans += dp1[i] - dp1[len2 - len1 + i + 1];else ans += dp0[i] - dp0[len2 - len1 + i + 1];}printf("%lld\n", ans);return 0;}
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