Compilare: user.cpp: In function ‘void build(int)’: user.cpp:18:36: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for(int j=1; j<=min(n, 1<<i-1); ++j) ^ user.cpp:20:24: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] for(int j=(1<<i-1)+1; j<=n; ++j) ^ user.cpp:21:52: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] v[i][j] = min(v[i-1][j], v[i-1][j-(1<<i-2)]); ^ user.cpp:9:9: warning: unused variable ‘t’ [-Wunused-variable] int t; ^ user.cpp: In function ‘int query(int, int)’: user.cpp:27:46: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] return min(v[step][y], v[step][x+(1<<step-1)-1]); ^ user.cpp: In function ‘int main()’: user.cpp:35:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d",&n,&m); ^ user.cpp:37:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&v[1][i]); ^ user.cpp:42:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&x,&y); ^