#include <bits/stdc++.h> using namespace std; #define rep(i, n) for(int i = 0; i < n; i++) #define pb push_back #define debug(x) cout << #x << " " << x << endl #define all(x) x.begin(),x.end() #define ll long long #define vi vector<int> #define vvi vector<vi> #define vvvi vector<vvi> #define vll vector<ll> #define vvll vector<vll> #define ld long double #define ull unsigned long long #define vull vector<ull> #define fi first #define se second #define PII pair<int,int> #define vPII vector<PII> #define getunique(v) {sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end());} #define int128 __int128 int main() { ios::sync_with_stdio(false); cin.tie(nullptr); // cout << setprecision(16) << fixed; // freopen("input.txt", "r", stdin); // freopen("output.txt", "w", stdout); int tt = 1; cin >> tt; while(tt--) { int n; string s; cin >> n >> s; vi dz; int pocz = 0, kon = 0; int j = 0; int cur = 0; while(j < n and s[j] == '0') j++; pocz = j; for(int i = j; i < n; i++){ if(s[i] == '1'){ if(cur){ dz.pb(cur); } cur = 0; }else{ cur++; } } kon = cur; sort(all(dz)); reverse(all(dz)); int str = 1; int ans = 0; int cnt = 0; for(int x: dz){ if(x-str <= 0) break; cnt++; ans += max(0,x-str); str += 4; } if(kon > pocz) swap(pocz,kon); ans += max(0,pocz-cnt*2); ans += max(0,kon-cnt-1); cout << n - ans << "\n"; } }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | #include <bits/stdc++.h> using namespace std; #define rep(i, n) for(int i = 0; i < n; i++) #define pb push_back #define debug(x) cout << #x << " " << x << endl #define all(x) x.begin(),x.end() #define ll long long #define vi vector<int> #define vvi vector<vi> #define vvvi vector<vvi> #define vll vector<ll> #define vvll vector<vll> #define ld long double #define ull unsigned long long #define vull vector<ull> #define fi first #define se second #define PII pair<int,int> #define vPII vector<PII> #define getunique(v) {sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end());} #define int128 __int128 int main() { ios::sync_with_stdio(false); cin.tie(nullptr); // cout << setprecision(16) << fixed; // freopen("input.txt", "r", stdin); // freopen("output.txt", "w", stdout); int tt = 1; cin >> tt; while(tt--) { int n; string s; cin >> n >> s; vi dz; int pocz = 0, kon = 0; int j = 0; int cur = 0; while(j < n and s[j] == '0') j++; pocz = j; for(int i = j; i < n; i++){ if(s[i] == '1'){ if(cur){ dz.pb(cur); } cur = 0; }else{ cur++; } } kon = cur; sort(all(dz)); reverse(all(dz)); int str = 1; int ans = 0; int cnt = 0; for(int x: dz){ if(x-str <= 0) break; cnt++; ans += max(0,x-str); str += 4; } if(kon > pocz) swap(pocz,kon); ans += max(0,pocz-cnt*2); ans += max(0,kon-cnt-1); cout << n - ans << "\n"; } } |