Compilare: main.cpp: In function 'void zet()': main.cpp:53:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i=1;i<s.size();i++ ) ~^~~~~~~~~ main.cpp:65:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i+z[i]<s.size() && s[z[i]]==s[i+z[i]] ) ~~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:101:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i=1;i<s.size();i++ ) ~^~~~~~~~~ main.cpp: In function 'char nextch()': main.cpp:23:29: 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,BUFF,stdin); ^ main.cpp: In function 'int main()': main.cpp:75:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "prefix.in", "r", stdin ); ^ main.cpp:76:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen( "prefix.out", "w", stdout ); ^