Compilare: main.cpp: In function 'int main()': main.cpp:15:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("drept2.in", "r", stdin); ^ main.cpp:18:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld %lld %lld\n", &m, &n, &a, &b); ^ main.cpp:22:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld\n", &st[i], &dr[i]); ^