Compilare: user.cpp: In function ‘void Query()’: user.cpp:58:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( m >= V[ Q[1] ].size() ) ^ user.cpp:65:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( m >= V[ Q[i] ].size() || V[ Q[i] ][ m ] != V[ Q[1] ][ m ] ) ^ user.cpp: In function ‘int main()’: user.cpp:81:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &n, &m); ^ user.cpp:84:30: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(S, 2002, stdin); ^ user.cpp:89:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:91:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &Q[j]); ^