Compilare: user.cpp: In function ‘int main()’: user.cpp:10:19: warning: unused variable ‘st’ [-Wunused-variable] int t, n, x, y, st, dr, len, potst, potdr; ^ user.cpp:10:23: warning: unused variable ‘dr’ [-Wunused-variable] int t, n, x, y, st, dr, len, potst, potdr; ^ user.cpp:10:27: warning: unused variable ‘len’ [-Wunused-variable] int t, n, x, y, st, dr, len, potst, potdr; ^ user.cpp:12:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^ user.cpp:15:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:17:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &fath[i]); ^ user.cpp:20:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &cost[fath[i]]); ^