Compilare: main.cpp: In function 'int main()': main.cpp:92:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < s.size() ; j++) ~~^~~~~~~~~~ main.cpp:105:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0 ; k < v.size() ; k++) ~~^~~~~~~~~~ main.cpp:136:23: warning: 'temp.cell::x' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << temp.x << " " << temp.y << "\n"; ^~~ main.cpp:136:40: warning: 'temp.cell::y' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << temp.x << " " << temp.y << "\n"; ^~~~ main.cpp:116:10: warning: 'character' may be used uninitialized in this function [-Wmaybe-uninitialized] char character; ^~~~~~~~~