Compilare: In file included from /usr/include/c++/4.8/cassert:43:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:33, from user.cpp:1: user.cpp: In function ‘int main()’: user.cpp:75:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(red.size() == rr); ^ user.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(green.size() == gg); ^ user.cpp:78:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(blue.size() == bb); ^ user.cpp:37:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rgb.in", "r", stdin); ^ user.cpp:38:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rgb.out", "w", stdout); ^