Compilare: user.cpp: In function ‘void solve()’: user.cpp:119:17: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(!coloane[j]) ^ user.cpp:53:16: warning: unused variable ‘di’ [-Wunused-variable] int i,j,di=0,dj=0,ix=1,iy,xx=1,yy=1; ^ user.cpp:53:21: warning: unused variable ‘dj’ [-Wunused-variable] int i,j,di=0,dj=0,ix=1,iy,xx=1,yy=1; ^ user.cpp:53:26: warning: unused variable ‘ix’ [-Wunused-variable] int i,j,di=0,dj=0,ix=1,iy,xx=1,yy=1; ^ user.cpp:53:31: warning: unused variable ‘iy’ [-Wunused-variable] int i,j,di=0,dj=0,ix=1,iy,xx=1,yy=1; ^ user.cpp: In function ‘void read()’: user.cpp:14:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&p,&n,&m,&k); ^ user.cpp:18:61: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&d[i].i1,&d[i].j1,&d[i].i2,&d[i].j2); ^