Compilare: main.cpp: In function 'bool ok(int)': main.cpp:35:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define MIN(a, b) (((a) < (b)) ? (a) : (b)) ~~~~^~~~~ main.cpp:54:24: note: in expansion of macro 'MIN' for(int i = 0; i < MIN(v.size(), k); i++) ^~~ main.cpp:54:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < MIN(v.size(), k); i++) ^ main.cpp: In function 'int main()': main.cpp:61:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("checkin.in","r",stdin); ^ main.cpp:62:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("checkin.out","w",stdout); ^ main.cpp:64:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:65:69: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= n; i++) scanf("%d%d", &b[i].first, &b[i].second); ^ main.cpp:66:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &k, &p); ^