Compilare: user.cpp: In function ‘int cuplaj(int)’: user.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<p[x].size();i++) { ^ user.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<p[x].size();i++) { ^ user.cpp: In function ‘int main()’: user.cpp:46:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algebra.in","r",stdin); ^ user.cpp:47:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algebra.out","w",stdout); ^ user.cpp:52:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:55:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf",&v[i][j]); ^