Compilare: main.cpp: In function 'int main()': main.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (bad[i] == wrong.size()) { ~~~~~~~^~~~~~~~~~~~~~~ main.cpp:49:78: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (bad[i] + bad[a] - (wrong.find({min(a, i), max(a, i)}) != wrong.end()) == wrong.size()) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~