Compilare: user.cpp: In function ‘int aflat(int, int)’: user.cpp:57:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < piese[tget(x - 1, y)].size(); i++) ^ user.cpp:58:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < piese[tget(x, y - 1)].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:89:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < piese[curent].size(); i++) ^ user.cpp:97:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < piese[piese[curent][i]].size(); j++) ^ user.cpp:101:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ok == piese[piese[curent][i]].size() - 1) ok = 0; ^ user.cpp:112:10: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (dx + dy == 1) ^ user.cpp: In function ‘int aflat(int, int)’: user.cpp:64:1: warning: control reaches end of non-void function [-Wreturn-type] } ^