Compilare: user.cpp: In function ‘int sum()’: user.cpp:30:15: warning: variable ‘j’ set but not used [-Wunused-but-set-variable] int i, k, j, ans, st, dr, sumtot=0; ^ user.cpp:30:23: warning: variable ‘st’ set but not used [-Wunused-but-set-variable] int i, k, j, ans, st, dr, sumtot=0; ^ user.cpp:30:27: warning: variable ‘dr’ set but not used [-Wunused-but-set-variable] int i, k, j, ans, st, dr, sumtot=0; ^ user.cpp: In function ‘int main()’: user.cpp:73:32: 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:75:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t[i].z); ^ user.cpp:78:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &t[i].x, &t[i].y); ^