Compilare: main.cpp: In function 'int main()': main.cpp:65:37: 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:66:39: 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 ); ^ main.cpp:68:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n, &k ); ^ main.cpp:71:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &v[i].b, &v[i].a ); ^ main.cpp: In function 'long long int cb()': main.cpp:45:10: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] return l; ^