Compilare: main.cpp: In function 'void add_line(int, long long int, long long int)': main.cpp:33:70: warning: narrowing conversion of 'A' from 'long long int' to 'int' inside { } [-Wnarrowing] Line[st] = {A, B, intersect(A, B, Line[st - 1].A, Line[st - 1].B)}; ^ main.cpp:33:70: warning: narrowing conversion of 'B' from 'long long int' to 'int' inside { } [-Wnarrowing] main.cpp: In function 'int main()': main.cpp:67:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("harbingers.in", "r", stdin); ^ main.cpp:68:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("harbingers.out", "w", stdout); ^ main.cpp:70:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:73:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^ main.cpp:78:61: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 2; i <= n ; ++i) scanf("%d%d", &B[i], &A[i]); ^