Compilare: user.cpp: In function ‘std::vector<int> intersectie(std::vector<int>&, std::vector<int>&)’: user.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && j < b.size()){ ^ user.cpp:22:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && j < b.size()){ ^ user.cpp: In function ‘std::vector<int> reuniune(std::vector<int>, std::vector<int>)’: user.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && j < b.size()){ ^ user.cpp:46:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && j < b.size()){ ^ user.cpp:47:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i] > b[j] && j < b.size()){ ^ user.cpp:57:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i] < b[j] && i < a.size()){ ^ user.cpp: In function ‘std::vector<int> diferenta(std::vector<int>, std::vector<int>)’: user.cpp:84:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && j < b.size()){ ^ user.cpp:84:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a.size() && j < b.size()){ ^ user.cpp:85:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i] > b[j] && j < b.size()){ ^ user.cpp:94:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(a[i] < b[j] && i < a.size()){ ^ user.cpp: In function ‘int main()’: user.cpp:189:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < St.size(); ++i){ ^ user.cpp:191:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Dr.size(); ++j) ^ user.cpp:194:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Dr.size(); ++j) ^ user.cpp:188:9: warning: unused variable ‘Num’ [-Wunused-variable] int Num = 0; ^ user.cpp:159:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expr.in", "r", stdin); ^ user.cpp:160:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]