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TLE成鬼了,想不通啊,为什么会超时#include<stdio.h> char map[4][4]; int dig[4][4]; int B[16],C[16]; int min=17; int cut=0; int Judge() { int i,j; int a=0,count=0; for(i=0;i<16;i++) { if(B[i]==1) { for(j=0;j<4;j++) { dig[i/4][j]=!dig[i/4][j]; dig[j][i%4]=!dig[j][i%4]; } dig[i/4][i%4]=!dig[i/4][i%4]; count++; } } for(i=0;i<4;i++) for(j=0;j<4;j++) { if(dig[i][j]==1) a++; } for(i=0;i<4;i++) for(j=0;j<4;j++) { if(map[i][j]=='+') dig[i][j]=0; else dig[i][j]=1; } if(a==16) return count; else return 17; } void Subset(int n) { int a,i; if(n==16) { a=Judge(); if(a<min) { for(i=0;i<16;i++) C[i]=B[i]; min=a; } return ; } B[n]=0; Subset(n+1); if(cut>=min) return; B[n]=1; cut++; Subset(n+1); cut--; } int main() { freopen("input.txt","r",stdin); int i,j; for(i=0;i<4;i++) scanf("%s",map[i]); for(i=0;i<4;i++) for(j=0;j<4;j++) { if(map[i][j]=='+') dig[i][j]=0; else dig[i][j]=1; } Subset(0); printf("%d\n",min); for(i=0;i<16;i++) if(C[i]==1) printf("%d %d\n",i/4+1,i%4+1); return 0; } Followed by: Post your reply here: |
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