Compilare: user.cpp: In function ‘int main()’: user.cpp:132:37: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] lines[i] = {-i, dp[i][1 - j & 1]}; ~~^~~ user.cpp:134:26: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] build(1, 1, n, 1 - j & 1); ~~^~~ user.cpp: In function ‘long long int query(int, int, int, int, int, int)’: user.cpp:111:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:118:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&k); ^ user.cpp:120:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&h[i]); ^