Compilare: user.cpp: In function ‘int Cnt(int, int, int, int, int)’: user.cpp:18:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1<0 || p1>L[val].size()-1) return 0; ^ user.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p2<0 || p2>L[val].size()-1) return L[val].size()-p1; ^ user.cpp: In function ‘int main()’: user.cpp:33:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("rangemode.in","r",stdin); ^ user.cpp:34:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("rangemode.out","w",stdout); ^ user.cpp:35:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n,&m); ^ user.cpp:38:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp:74:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x,&y); ^