Compilare: user.cpp: In function ‘int main()’: user.cpp:6:17: warning: unused variable ‘minima’ [-Wunused-variable] int t,n,m,x,y,minima,minimb,minim,i; ^ user.cpp:6:24: warning: unused variable ‘minimb’ [-Wunused-variable] int t,n,m,x,y,minima,minimb,minim,i; ^ user.cpp:6:31: warning: unused variable ‘minim’ [-Wunused-variable] int t,n,m,x,y,minima,minimb,minim,i; ^ user.cpp:4:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("chatnoir.in","r",stdin); ^ user.cpp:5:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("chatnoir.out","w",stdout); ^ user.cpp:7:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:10:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&x,&y); ^