Compilare: main.cpp: In function 'int main()': main.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ans.size(); i++) ~~^~~~~~~~~~~~ main.cpp:89:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j++; j < ans.size(); j++) ~~^~~~~~~~~~~~ main.cpp:99:41: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf ("%d ", ansfin.size()); ^ main.cpp:41:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.in" ,"r", stdin); ^ main.cpp:42:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.out", "w", stdout); ^ main.cpp:46:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ main.cpp:48:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &a[i], &b[i]); ^