제출 #105861

#제출 시각아이디문제언어결과실행 시간메모리
105861Alexa2001Lamps (JOI19_lamps)C++17
0 / 100
1073 ms18116 KiB
#include <bits/stdc++.h> using namespace std; const int Nmax = 1e6 + 5; int a[Nmax], b[Nmax], a0[Nmax], b0[Nmax]; int i, n; int main() { // freopen("input", "r", stdin); cin.sync_with_stdio(false); cin >> n; string A, B; cin >> A >> B; for(i=1; i<=n; ++i) a0[i] = A[i-1] - '0', b0[i] = B[i-1] - '0'; for(i=1; i<=n+1; ++i) a[i] = a0[i-1] ^ a0[i], b[i] = b0[i-1] ^ b0[i]; int cnt = 0, j; for(i=1; i<=n+1; ++i) if(a[i] ^ b[i]) { int k = -1; for(j=i+1; k == -1 && j<=n+1; ++j) if(a[j] & b[j]) k = j; if(k == -1) k = n+1; for(j=k; j>=i && !(a[j] ^ b[j]); --j); if(j == i) continue; cnt ++; a[j] ^= 1; a[i] ^= 1; for(--j; j>i; --j) a[j] = 0; i = j; } int cnt2 = 0; for(j=1; j<=n+1; ++j) if(a[j] ^ b[j]) cnt2 ++; cnt += (cnt2+1) / 2; cout << cnt << '\n'; return 0; }
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