Compilare: user.cpp: In function ‘int main()’: user.cpp:25:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < strlen(str); j++) ^ user.cpp:39:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (strlen(str) < m) ^ user.cpp:11:31: warning: unused variable ‘l’ [-Wunused-variable] int m,n,x1,y1,x2,y2,X,Y,P,l,cc,b[101][101],xf,yf,mini=999,d[101][101],s,f; ^ user.cpp:11:33: warning: unused variable ‘cc’ [-Wunused-variable] int m,n,x1,y1,x2,y2,X,Y,P,l,cc,b[101][101],xf,yf,mini=999,d[101][101],s,f; ^ user.cpp:11:48: warning: unused variable ‘xf’ [-Wunused-variable] int m,n,x1,y1,x2,y2,X,Y,P,l,cc,b[101][101],xf,yf,mini=999,d[101][101],s,f; ^ user.cpp:11:51: warning: unused variable ‘yf’ [-Wunused-variable] int m,n,x1,y1,x2,y2,X,Y,P,l,cc,b[101][101],xf,yf,mini=999,d[101][101],s,f; ^ user.cpp:12:10: warning: unused variable ‘a’ [-Wunused-variable] char a[100][100]; ^ user.cpp:44:14: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] Q[1].x=x1; ^ user.cpp:45:14: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] Q[1].y=y1; ^ user.cpp:142:24: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(X!=x2&&Y!=y2) ^ user.cpp:142:17: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(X!=x2&&Y!=y2) ^ user.cpp:159:16: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr=Q[poz].p/2; ^