Compilare: main.cpp: In function 'int main()': main.cpp:55:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[i].first == last) main.cpp:41:28: warning: unused variable 'k' [-Wunused-variable] int n, min, max, i, j, k=1, diff=0; ^ main.cpp:39:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("secv5.in","r",stdin); ^ main.cpp: In function 'void cit(unsigned int&)': main.cpp:16:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,MAXIM,stdin); ^ main.cpp:25:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,MAXIM,stdin); ^