Compilare: main.cpp: In function 'void solve()': main.cpp:27:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < vec.size(); ++j) ~~^~~~~~~~~~~~ main.cpp:56:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < vec.size(); ++j) ~~^~~~~~~~~~~~ main.cpp:74:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < vec.size(); ++i) ~~^~~~~~~~~~~~ main.cpp: At global scope: main.cpp:86:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^