Compilare: user.cpp: In function ‘void erase_interval(int, int)’: user.cpp:259:37: warning: unused variable ‘rgt’ [-Wunused-variable] int lft = (*it1).first, rgt = (*it1).second; ^~~ user.cpp:270:17: warning: unused variable ‘lft’ [-Wunused-variable] int lft = (*it2).first, rgt = (*it2).second; ^~~ user.cpp: In function ‘int main()’: user.cpp:289:37: 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:290:39: 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:295:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &Q); ^ user.cpp:302:38: 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:308:38: 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:314:38: 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:319:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^ user.cpp:325:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", s + 1); ^