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mirror of https://git.sb/baoshuo/OI-codes.git synced 2024-12-24 03:11:58 +00:00

#929. [2019.10长郡集训day12]古代龙人的谜题(puzzle)

https://sjzezoj.com/submission/55108
This commit is contained in:
Baoshuo Ren 2022-08-20 16:43:17 +08:00
parent eb9b66ed48
commit 21757eb268
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
68 changed files with 249 additions and 0 deletions

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#include <iostream>
#include <string>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e6 + 5;
int t, n;
int cnt, len[N];
int cnt_odd, cnt_even;
std::string s;
long long ans;
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> t >> n >> s;
s = ' ' + s;
len[0] = 1;
for (int i = 1; i <= n; i++) {
len[s[i] == '1' ? ++cnt : cnt]++;
}
for (int i = 1; i <= cnt; i++) {
if (i % 2 == 1) {
ans += static_cast<long long>(cnt_even) * len[i];
cnt_even += len[i - 1];
} else {
ans += static_cast<long long>(cnt_odd) * len[i];
cnt_odd += len[i - 1];
}
}
for (int i = 1; i <= cnt; i++) {
if (len[i - 1] > 1 && len[i] > 1) {
ans += static_cast<long long>(len[i - 1] - 1) * (len[i] - 1);
}
}
cout << ans << endl;
return 0;
}

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