Compilare: main.cpp: In function 'int main()': main.cpp:50:58: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] if(lookup_table[i-1][j]<lookup_table[i-1][j+(1<<i-1)]) ~^~ main.cpp:53:53: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] lookup_table[i][j]=lookup_table[i-1][j+(1<<i-1)]; ~^~ main.cpp:14:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d", &n, &nrquerry); ^ main.cpp:17:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &lookup_table[0][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:23:12: warning: iteration 17 invokes undefined behavior [-Waggressive-loop-optimizations] pow2[i]=2*pow2[i-1]; ~~~~~~~^~~~~~~~~~~~ main.cpp:22:10: note: within this loop for(i=1;i<=18;i++){ ~^~~~