Compilare: user.cpp: In function ‘long long int cmap(int, int)’: user.cpp:66:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < work.size(); i++) ^ user.cpp:67:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i + 1; j < work.size() && j - i <= limit; j++) ^ user.cpp: In function ‘int main()’: user.cpp:75:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in","r",stdin); ^ user.cpp:76:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out","w",stdout); ^ user.cpp:78:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:80:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &P[i].first, &P[i].second); ^