Compilare: main.cpp: In function 'int main()': main.cpp:16:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] f >> a + 1 >> b + 1; ^ main.cpp:16:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] f >> a + 1 >> b + 1; ^ main.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < res.size(); ++i) ^