Compilare: user.cpp: In function ‘int main()’: user.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<num[i].size(); j++) ~^~~~~~~~~~~~~~ user.cpp:46:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==num[i].size()){ ~^~~~~~~~~~~~~~~ user.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<num[i].size(); j++) ~^~~~~~~~~~~~~~ user.cpp:19:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("numerologie.in", "r",stdin); ^ user.cpp:20:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("numerologie.out", "w",stdout); ^ user.cpp:22:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:24:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^