Compilare: user.cpp: In function ‘void ReadInput()’: user.cpp:36:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &L, &Q); ^ user.cpp:39:72: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &edge.u, &edge.v, &edge.take_cost, &edge.skip_cost); ^ user.cpp: In function ‘void ProcessQueries()’: user.cpp:133:80: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] Query query; scanf("%d%d%d%d", &query.u, &query.v, &query.left, &query.right); query.index = i; ^