Submission #563567

#TimeUsernameProblemLanguageResultExecution timeMemory
563567rafatoaMutating DNA (IOI21_dna)C++17
100 / 100
51 ms9608 KiB
#include <bits/stdc++.h> using namespace std; int n; int pre[100005][3][3]; int cnta[100005][3]; int cntb[100005][3]; int ix(char c){ if(c == 'A') return 0; else if(c == 'C') return 1; else return 2; } void init(string a, string b){ n = a.size(); for(int i=0; i<=n; i++) for(int j=0; j<3; j++){ cnta[i][j] += cnta[i-1][j] + (ix(a[i-1]) == j ? 1 : 0); cntb[i][j] += cntb[i-1][j] + (ix(b[i-1]) == j ? 1 : 0); } for(int i=0; i<=n; i++) for(int j=0; j<3; j++) for(int k=0; k<3; k++) pre[i][j][k] += pre[i-1][j][k] + (ix(a[i-1]) == j && ix(b[i-1]) == k ? 1 : 0); } int get_distance(int x, int y){ x++; y++; for(int j=0; j<3; j++) if(cnta[y][j]-cnta[x-1][j] != cntb[y][j]-cntb[x-1][j]) return -1; int v[3][3]; for(int j=0; j<3; j++) for(int k=0; k<3; k++) v[j][k] = pre[y][j][k] - pre[x-1][j][k]; int ans = 0; for(int i=0; i<3; i++) for(int j=i+1; j<3; j++){ if(v[i][j] >= v[j][i]){ ans += v[j][i]; v[i][j] -= v[j][i]; v[j][i] = 0; } else { ans += v[i][j]; v[j][i] -= v[i][j]; v[i][j] = 0; } } // while(v[0][1] && v[1][2] && v[2][0]){ // v[0][1]--; v[1][2]--; v[2][0]--; // ans += 2; // } // while(v[1][0] && v[2][1] && v[0][2]){ // v[1][0]--; v[2][1]--; v[0][2]--; // ans += 2; // } //ESTO ES MAS OPTIMO ans += v[0][1]*2 + v[1][0]*2; return ans; }
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