Compilare: main.cpp: In function 'void sortare_interclasare(std::vector<int>, std::vector<int>, std::vector<int>&)': main.cpp:10:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == a.size()) { ~~^~~~~~~~~~~ main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == b.size()) { ~~^~~~~~~~~~~ main.cpp: In function 'void merge_sort(std::vector<int>&)': main.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = mid; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in", "r", stdin); ^ main.cpp:48:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out", "w", stdout); ^ main.cpp:51:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &n); ^ main.cpp:53:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &numar); ^