Compilare: user.cpp: In function ‘int main()’: user.cpp:24:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (low >= 0 && low < s.size()) Min=min(Min,abs(v[i] - s[low])); ~~~~^~~~~~~~~~ user.cpp:25:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (low >= 1 && low - 1 < s.size()) Min=min(Min,abs(v[i] - s[low-1])); ~~~~~~~~^~~~~~~~~~ user.cpp: In function ‘int read()’: user.cpp:8:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] char c[12];scanf("%s",c);int p=0; ^ user.cpp: In function ‘int main()’: user.cpp:16:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("slidingwindow.in","r",stdin); ^ user.cpp:28:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("slidingwindow.out","w",stdout); ^