Compilare: user.cpp: In function ‘int calculate(int, int)’: user.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (crt == strlen(s[y])-1) ^ user.cpp: In function ‘void process()’: user.cpp:69:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (comun[i][j] == strlen(s[j])-1) { ^ user.cpp: In function ‘void solve()’: user.cpp:126:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int j = (i < nods.size()-1 ? comun[nods[i+1]][nods[i]] : 1); ^ user.cpp:127:15: warning: statement has no effect [-Wunused-value] for (j; s[nods[i]][j]; j++) ^ user.cpp: In function ‘void citire()’: user.cpp:20:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:22:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s[i]); ^ user.cpp: In function ‘int main()’: user.cpp:135:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("adn.in", "r", stdin); ^ user.cpp:136:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("adn.out", "w", stdout); ^ In file included from /usr/include/stdio.h:934:0, from /usr/include/c++/4.8/cstdio:42, from /usr/include/c++/4.8/ext/string_conversions.h:43, from /usr/include/c++/4.8/bits/basic_string.h:2815, from /usr/include/c++/4.8/string:52, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: In function ‘char* gets(char*)’, inlined from ‘void citire()’ at user.cpp:22:13: /usr/include/i386-linux-gnu/bits/stdio2.h:230:28: warning: call to ‘__gets_warn’ declared with attribute warning: please use fgets or getline instead, gets can't specify buffer size [enabled by default] return __gets_warn (__str); ^ /tmp/cc1WfUP5.o: In function `citire()': user.cpp:(.text+0x3a): warning: the `gets' function is dangerous and should not be used.