Compilare: user.cpp: In function ‘int main()’: user.cpp:21:9: warning: unused variable ‘nra’ [-Wunused-variable] int nra = 0, nrr = 0; ^ user.cpp:21:18: warning: unused variable ‘nrr’ [-Wunused-variable] int nra = 0, nrr = 0; ^ user.cpp:30:9: warning: variable ‘start’ set but not used [-Wunused-but-set-variable] int start; ^ user.cpp:18:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d%d", &n, &m); ^ user.cpp:24:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d%d %c", &x, &y, &c); ^