Compilare: user.cpp: In function ‘int main()’: user.cpp:26:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, k, x, y, c, pret; ^ user.cpp:26:24: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, j, k, x, y, c, pret; ^ user.cpp:26:27: 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:58:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, con, cost; ^ user.cpp: In function ‘int main()’: user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("online.in","r",stdin); ^ user.cpp:24:37: 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); ^ user.cpp:28:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:30:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&original[ i ].x,&original[ i ].y,&original[ i ].c); ^ user.cpp:37:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:45:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&original[ n ].x,&original[ n ].y,&original[ n ].c); ^