Compilare: main.cpp: In function 'int main()': main.cpp:17:76: warning: variable 'ans' set but not used [-Wunused-but-set-variable] int cer,n,i,j,k,incbun,sfbun,incprost,sfprost,lin,col,min=10020,max=-1,ans,mij; ^~~ main.cpp:15:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rover.in","r",stdin); ^ main.cpp:16:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rover.out","w",stdout); ^ main.cpp:18:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&cer,&n); ^ main.cpp:21:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ main.cpp:27:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^ main.cpp:209:20: warning: 'mij' may be used uninitialized in this function [-Wmaybe-uninitialized] min=mij+1; ~~~^~~~~~