Compilare: main.cpp: In function 'int main()': main.cpp:19:19: warning: unused variable 'vmax' [-Wunused-variable] int t, n, i, j, vmax, k1, st, dr, a; ^~~~ main.cpp:19:25: warning: unused variable 'k1' [-Wunused-variable] int t, n, i, j, vmax, k1, st, dr, a; ^~ main.cpp:20:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &t, &n, &st, &dr); ^ main.cpp:25:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a); ^