Compilare: user.cpp: In function ‘int main()’: user.cpp:38:10: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘void DFS2(int, int, int)’: user.cpp:98:7: warning: unused variable ‘curr’ [-Wunused-variable] int curr = u; ^ user.cpp:99:7: warning: unused variable ‘ck’ [-Wunused-variable] int ck = k; ^ user.cpp: In function ‘int main()’: user.cpp:41:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &N, &Q); ^ user.cpp:45:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^ user.cpp:51:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &val[i]); ^ user.cpp:71:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^