Compilare: main.cpp: In function 'per calc(std::vector<int>, std::vector<int>)': main.cpp:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==a.v.size() && j==b.v.size()) break; ~^~~~~~~~~~~~ main.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==a.v.size() && j==b.v.size()) break; ~^~~~~~~~~~~~ main.cpp:27:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==a.v.size()){ ~^~~~~~~~~~~~ main.cpp:31:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if (j==b.v.size()){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permutariab.in", "r", stdin); ^ main.cpp:55:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("permutariab.out", "w", stdout); ^