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 ‘void Fakinsolve()’: user.cpp:116:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(Mat[i].size() >= j + 2); ^ user.cpp:117:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(Mat[i - 1].size() >= j + 1); ^ user.cpp: In function ‘int main()’: user.cpp:220:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle2.in","r",stdin); ^ user.cpp:221:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle2.out","w",stdout); ^ user.cpp: In function ‘char getChar()’: user.cpp:20:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUFFER_SIZE, 1, stdin); ^