Compilare: user.cpp: In function ‘void Solve()’: user.cpp:41:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,k,x,y,cost,t,x0,y0; ^ user.cpp:41:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,x,y,cost,t,x0,y0; ^ user.cpp: In function ‘void Read()’: user.cpp:25:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&M); ^ user.cpp:28:28: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,VMax,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:83:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pixy.in","r",stdin); ^ user.cpp:84:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pixy.out","w",stdout); ^