Compilare: user.cpp: In function ‘int main()’: user.cpp:47:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Line.size();i++){ ^ user.cpp:51:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<Column.size();j++){ ^ user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drept3.in","r",stdin); ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drept3.out","w",stdout); ^ user.cpp:34:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:36:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld %ld",&x,&y,&d); ^