Compilare: user.cpp: In function ‘std::pair<std::pair<int, int>, std::pair<int, int> > update_interval(int, int)’: user.cpp:172:9: warning: unused variable ‘l’ [-Wunused-variable] int l = st, r = dr; ^ user.cpp:172:17: warning: unused variable ‘r’ [-Wunused-variable] int l = st, r = dr; ^ user.cpp: In function ‘int main()’: user.cpp:218:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brasov.in", "r", stdin); ^ user.cpp:219:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("brasov.out", "w", stdout); ^ user.cpp:225:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &Q); ^ user.cpp:232:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &st, &dr); ^ user.cpp:238:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &st, &dr); ^ user.cpp:244:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &st, &dr); ^ user.cpp:249:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^ user.cpp:255:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^