Compilare: user.cpp: In function ‘int main()’: user.cpp:17:24: warning: unused variable ‘ln’ [-Wunused-variable] int n, m, i, j, k, ln, lg, ma, st, dr; ^~ user.cpp:17:32: warning: unused variable ‘ma’ [-Wunused-variable] int n, m, i, j, k, ln, lg, ma, st, dr; ^~ user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "rmq.in", "r", stdin ); ^ user.cpp:15:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "rmq.out", "w", stdout ); ^ user.cpp:19:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n, &m ); ^ user.cpp:20:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for ( i = 1; i <= n; ++i ) scanf( "%d", &D[ 0 ][ i ] ); ^ user.cpp:31:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &st, &dr ); ^