Compilare: user.cpp: In function ‘int main()’: user.cpp:45:5: warning: unused variable ‘gata’ [-Wunused-variable] int gata,q,j,t,i,ok; ^ user.cpp:45:18: warning: unused variable ‘ok’ [-Wunused-variable] int gata,q,j,t,i,ok; ^ user.cpp:43:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pluricex.in","r",stdin); ^ user.cpp:44:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pluricex.out","w",stdout); ^ user.cpp:46:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&k,&dp); ^ user.cpp:48:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&q); ^ user.cpp:49:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(j=0;j<q;++j) {scanf("%d",&t); v[i][t]=1;} ^