Compilare: main.cpp: In function 'void read()': main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(line); i++) ~^~~~~~~~~~~~~ main.cpp: In function 'void phill(int, int, int)': main.cpp:50:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind==strlen(line)) ~~~^~~~~~~~~~~~~~ main.cpp:55:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind<strlen(line) && mat[lin+directii[ind+1].dirx][col+directii[ind+1].diry]!=-1) ~~~^~~~~~~~~~~~~