Compilare: user.cpp: In function ‘void DeUnion(int, int)’: user.cpp:87:9: warning: variable ‘i’ set but not used [-Wunused-but-set-variable] int i, j, sch=0; ^ user.cpp: In function ‘void citire()’: user.cpp:29:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:32:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &a, &b); ^ user.cpp: In function ‘void solve()’: user.cpp:48:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &p, &a, &b); ^