Compilare: main.cpp: In function 'int main()': main.cpp:53:79: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] lookup_table[i][j]=min(lookup_table[i-1][j], lookup_table[i-1][j+(1<<i-1)]); ~^~ main.cpp:17:21: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &n); ^ main.cpp:18:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &nrquerry); ^ main.cpp:20:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &v[i]); ^ main.cpp:74:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d", &x, &y); ^ main.cpp:24:12: warning: iteration 17 invokes undefined behavior [-Waggressive-loop-optimizations] pow2[i]=pow2[i-1]*2; ~~~~~~~^~~~~~~~~~~~ main.cpp:23:10: note: within this loop for(i=1;i<=18;i++){ ~^~~~