Submission #967950

#	Time	Username	Problem	Language	Result	Execution time	Memory
967950		weakweakweak	Line Town (CCO23_day1problem3)	C++17	0 / 25	0 ms	348 KiB

Main

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

int n, a[5000110];

int main () {
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n;
    bool y = 1;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        if (i > 1 and a[i] < a[i - 1]) y = 0;
    }
    if (y) cout << "0\n";
    
    int cntf[2] = {0}, cntb[2] = {0}, ans = INT_MAX;
    for (int i = 1; i <= n; i++) {
        if (a[i] == -1) cntb[0]++;
        else cntb[1]++;
    }
    for (int i = 1; i <= n + 1; i++) {
        if (cntb[0] % 2 == 0 and cntf[1] % 2 == 0) ans = min(ans, (cntb[0] + cntf[1]) >> 1 );
        if (a[i] == -1) cntb[0]--, cntf[0]++;
        else cntf[1]++, cntb[1]--;
    }
    if (ans == INT_MAX) ans = -1;
    cout << ans << '\n';
return 0;}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 3
• Subtask 3: 0 / 3
• Subtask 4: 0 / 4
• Subtask 5: 0 / 4
• Subtask 6: 0 / 3
• Subtask 7: 0 / 2
• Subtask 8: 0 / 3