Codeforces Round #719 (Div. 3)E. Arranging The Sheep
给一个字符串, *代表羊, .代表空位, 求怎么移动能让羊排成一列.
这题是acwing的那个模板题的衍生, 要先找到中间羊, 然后找到它的位置, 然后平移(坐标 – 第几个), 求和即可.
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#include "bits/stdc++.h" using namespace std; // fast read const auto fr = [](){ std::ios_base::sync_with_stdio(0); std::cin.tie(0); std::cout << std::fixed << std::setprecision(12); return 1; }(); template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v); template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.first << ", " << p.second << ")"; }; template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) { cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]"; } template<typename A, typename B> istream& operator>>(istream& cin, pair<A, B> &p) { cin >> p.first; return cin >> p.second; } // vars: using ll = long long; using ull = unsigned long long; using ld = long double; using vi = std::vector<int>; using vl = std::vector<ll>; using vvi = std::vector<vi>; using vvl = std::vector<vl>; using pii = std::pair<int,int>; using pil = std::pair<int,ll>; using pli = std::pair<ll,int>; using pll = std::pair<ll,ll>; using vpii = std::vector<pii>; using vvpii = std::vector<vpii>; // consts ll M = 0; // ksm (kuai su mi) ll ksm(ll a,ll p){ll res=1;while(p){if(p&1){res=res*a%M;}a=a*a%M;p>>=1;}return res;} int main() { fr; int T; cin >> T; while (T--) { int N; cin >> N; string s; cin >> s; ll res = 0; ll count = 0; for (int i = 0; i < N; i++) { if(s[i] == '*') { count++; } } if(count == 0 || count == N) { cout << 0 << endl; continue; } ll t = -1; ll med = -1; for (int i = 0; i < N; i++) { if(s[i] == '*') { t++; } if(t == count / 2) { med = i; break; } } ll tt = med - count / 2; for (int i = 0; i < N; i++) { if(s[i] == '*') { res += abs(tt - i); tt++; } } cout << res << endl; } return 0; } |