提出 #66325157

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ソースコード 拡げる

// Author: Andimeo
// Date: 2025-5-31 19:56:29

#include<bits/stdc++.h>
using namespace std;

#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
  enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifdef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (auto it = d.b; it != d.e; ++it)
    *this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

#define int long long
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define pb push_back
#define tc int tt, qq = 0; cin >> tt; while(qq++ < tt)
#define cs cout << "Case " << qq << ": "
#define speed ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
using hash_t = uint64_t;

void solve() {
    int n; string s; cin >> n >> s;
    vector<int> dp(n + 1), cnt(n + 1), cntr(n + 2);
    for (int i = 1; i <= n; i++) {
        cnt[i] = cnt[i-1] + (s[i-1] == '1');
    }
    for (int i = n; i >= 1; i--) {
        cntr[i] = cntr[i+1] + (s[i-1] == '1');
    }
    if (cnt[n] == 0) {
        cout << 0 << endl;
        return;
    }
    int ans = 1e18;
    for (int i = 1; i <= n; i++) {
        dp[i] = min(dp[i-1], cnt[i-1]) + (s[i-1] == '0');
        // debug() << imie(i) imie(dp[i]) imie(cntr[i+1]);
        ans = min(ans, dp[i] + cntr[i+1]);
    }
    cout << ans << endl;
}

signed main() {
    speed
    tc {
        solve();
    }
    return 0;
}

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