Compilare: main.cpp: In function 'void solve()': main.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size() - 1; i++) ~~^~~~~~~~~~~~~~ main.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < v.size(); j++) ~~^~~~~~~~~~ main.cpp: At global scope: main.cpp:45:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^