Compilare: user.cpp: In function ‘int main()’: user.cpp:118:14: warning: variable ‘it2’ set but not used [-Wunused-but-set-variable] auto it2=currup.begin(); ^ user.cpp:73:11: warning: variable ‘m’ set but not used [-Wunused-but-set-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:73:15: warning: unused variable ‘i’ [-Wunused-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:73:17: warning: unused variable ‘j’ [-Wunused-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:74:29: warning: variable ‘sum’ set but not used [-Wunused-but-set-variable] long long mx=-vmax,nr=0,sum,nru=0,nrlin,nrcol,nrcurr; ^ user.cpp:74:39: warning: variable ‘nrlin’ set but not used [-Wunused-but-set-variable] long long mx=-vmax,nr=0,sum,nru=0,nrlin,nrcol,nrcurr; ^ user.cpp:74:45: warning: unused variable ‘nrcol’ [-Wunused-variable] long long mx=-vmax,nr=0,sum,nru=0,nrlin,nrcol,nrcurr; ^ user.cpp:74:51: warning: unused variable ‘nrcurr’ [-Wunused-variable] long long mx=-vmax,nr=0,sum,nru=0,nrlin,nrcol,nrcurr; ^ user.cpp:71:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.in","r",stdin); ^ user.cpp:72:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.out","w",stdout); ^ user.cpp:76:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(si,sizeof(char),sizeof(si),stdin); ^