Compilare: user.cpp: In function ‘int main()’: user.cpp:49:11: warning: unused variable ‘sol’ [-Wunused-variable] int m,sol=0,x,y,c,q; ^ user.cpp:49:17: warning: unused variable ‘x’ [-Wunused-variable] int m,sol=0,x,y,c,q; ^ user.cpp:49:19: warning: unused variable ‘y’ [-Wunused-variable] int m,sol=0,x,y,c,q; ^ user.cpp:49:21: warning: unused variable ‘c’ [-Wunused-variable] int m,sol=0,x,y,c,q; ^ user.cpp:47:35: 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:48:37: 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:50:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:51:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=m;i++) scanf("%d%d%d",&v[i].x,&v[i].y,&v[i].c); ^ user.cpp:54:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&q); ^ user.cpp:57:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&v[n].x,&v[n].y,&v[n].c); ^