Compilare: user.cpp: In function ‘int main()’: user.cpp:31:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, r, t, st, dr; ^ user.cpp:31:21: warning: unused variable ‘x’ [-Wunused-variable] int n, m, i, j, x, y, r, t, st, dr; ^ user.cpp:31:24: warning: unused variable ‘y’ [-Wunused-variable] int n, m, i, j, x, y, r, t, st, dr; ^ user.cpp:31:27: warning: unused variable ‘r’ [-Wunused-variable] int n, m, i, j, x, y, r, t, st, dr; ^ user.cpp:28:36: 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:29:38: 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:33:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&n,&m ); ^ user.cpp:34:58: 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",&v[ 0 ][ i ] ); ^ user.cpp:39:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&st,&dr ); ^