online compiler and debugger for c/c++

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/****************************************************************************** Welcome to GDB Online. GDB online is an online compiler and debugger tool for C, C++, Python, Java, PHP, Ruby, Perl, C#, VB, Swift, Pascal, Fortran, Haskell, Objective-C, Assembly, HTML, CSS, JS, SQLite, Prolog. Code, Compile, Run and Debug online from anywhere in world. *******************************************************************************/ #include <stdio.h> #include <time.h> int main() { int a,b,c,d,e; int n,t,x,y,q; int covers[64][23]; int covered[64]; int uncovered; int min_uncovered=63; time_t start_t,end_t; start_t=time(NULL); for(a=0;a<64;a++){ covered[a]=n=0; covers[a][n++]=a; for(x=a%8+1,y=a/8+1;x<8 && y<8;x++,y++)covers[a][n++]=y*8+x; for(x=a%8-1,y=a/8-1;x>=0 && y>=0;x--,y--)covers[a][n++]=y*8+x; for(x=a%8+1,y=a/8-1;x<8 && y>=0;x++,y--)covers[a][n++]=y*8+x; for(x=a%8-1,y=a/8+1;x>=0 && y<8;x--,y++)covers[a][n++]=y*8+x; x=a%8;y=a/8; if(y>0) { if(x>1)covers[a][n++]=a-10; if(x<6)covers[a][n++]=a-6; if(y>1) { if(x>0)covers[a][n++]=a-17; if(x<7)covers[a][n++]=a-15; } } if(y<7) { if(x>1)covers[a][n++]=a+6; if(x<6)covers[a][n++]=a+10; if(y<6) { if(x>0)covers[a][n++]=a+15; if(x<7)covers[a][n++]=a+17; } } covers[a][n]=-1; if(n>t)t=n; } q=t=0; for(a=0;a<60;a++){ for(n=0;covers[a][n]>=0;n++)covered[covers[a][n]]++; for(b=a+1;b<61;b++){ for(n=0;covers[b][n]>=0;n++)covered[covers[b][n]]++; for(c=b+1;c<62;c++){ for(n=0;covers[c][n]>=0;n++)covered[covers[c][n]]++; for(d=c+1;d<63;d++){ for(n=0;covers[d][n]>=0;n++)covered[covers[d][n]]++; for(e=d+1;e<64;e++){ t++; for(n=0;covers[e][n]>=0;n++)covered[covers[e][n]]++; for(n=uncovered=0;n<64;n++){ if(covered[n]==0)uncovered++; } if(uncovered==min_uncovered)q++; else if(uncovered<min_uncovered){ min_uncovered=uncovered; q=1; } for(n=0;covers[e][n]>=0;n++)covered[covers[e][n]]--; } for(n=0;covers[d][n]>=0;n++)covered[covers[d][n]]--; } for(n=0;covers[c][n]>=0;n++)covered[covers[c][n]]--; } for(n=0;covers[b][n]>=0;n++)covered[covers[b][n]]--; } for(n=0;covers[a][n]>=0;n++)covered[covers[a][n]]--; } end_t=time(NULL); printf("positions checked: %d ",t); printf("minimum uncovered: %d (%d positions) ",min_uncovered,q); printf("elapsed time: %ld seconds",end_t-start_t); return 0; }

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