Compilare: main.cpp: In function 'int main()': main.cpp:42:20: warning: unused variable 'last' [-Wunused-variable] long long mid, last; ^~~~ main.cpp: In function 'void read()': main.cpp:13:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &K); ^ main.cpp:15:49: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].second, &v[i].first); ^ main.cpp: In function 'int main()': main.cpp:35:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tarabe.in", "r", stdin); ^ main.cpp:36:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tarabe.out", "w", stdout); ^