Compilare: main.cpp: In function 'int solve()': main.cpp:47:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < gol.size(); ++i) ~~^~~~~~~~~~~~ main.cpp:51:8: warning: variable 'pp' set but not used [-Wunused-but-set-variable] int pp = -1; ^~ main.cpp:75:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0, j = gol.size() - 1; i < gol.size(); ++i, --j) ~~^~~~~~~~~~~~ main.cpp:114:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = gol.size() - 1, j = 0; j < gol.size(); ++j, --i) ~~^~~~~~~~~~~~