Compilare: user.cpp: In function ‘int main()’: user.cpp:20:15: warning: unused variable ‘j’ [-Wunused-variable] int i,x,y,j,u,ok,m; ^ user.cpp:20:19: warning: unused variable ‘ok’ [-Wunused-variable] int i,x,y,j,u,ok,m; ^ user.cpp:20:22: warning: unused variable ‘m’ [-Wunused-variable] int i,x,y,j,u,ok,m; ^ user.cpp:21:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("steinsgate.in","r",stdin); ^ user.cpp:22:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("steinsgate.out","w",stdout); ^ user.cpp:24:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&N,&M,&K); ^ user.cpp:26:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&x,&y); ^ user.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&d[0][i]); ^