Compilare: main.cpp: In function 'int main()': main.cpp:83:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s.size(); j++) ~~^~~~~~~~~~ main.cpp:125:40: warning: 'temp.cell::y' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << temp.x << " " << temp.y << "\n"; ^~~~ main.cpp:125:23: warning: 'temp.cell::x' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << temp.x << " " << temp.y << "\n"; ^~~ main.cpp:107:10: warning: 'ch' may be used uninitialized in this function [-Wmaybe-uninitialized] char ch; ^~