Compilare: user.cpp: In function ‘int main()’: user.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( b[x][y] < z && a[x][y] >= a[x][y+1] ){ ^ user.cpp:69:38: warning: unused variable ‘tmp’ [-Wunused-variable] int y=1,z=st,k=n,zz = dr - st +1,tmp = 0,q,k_initial=1; ^ user.cpp:69:46: warning: unused variable ‘q’ [-Wunused-variable] int y=1,z=st,k=n,zz = dr - st +1,tmp = 0,q,k_initial=1; ^ user.cpp:19:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.in" , "r" , stdin); ^ user.cpp:20:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out", "w" , stdout); ^ user.cpp:21:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d\n",&caz,&n,&st,&dr); ^ user.cpp:29:40: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( sbuf , 20000,stdin ); ^