Compilare: user.cpp: In function ‘int main()’: user.cpp:31:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, k, x, y, c, pret; ^ user.cpp:31:24: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, j, k, x, y, c, pret; ^ user.cpp:31:27: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, j, k, x, y, c, pret; ^ user.cpp: In function ‘int apm(int, int)’: user.cpp:70:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, con, cost; ^ user.cpp: In function ‘int main()’: user.cpp:29:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("online.out","w",stdout); ^