Compilare: user.cpp: In function ‘int main()’: user.cpp:72:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==s[i].size()-1) { ok=true; break; } ^ user.cpp:100:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==s[i].size()-1) k=urm[k]; ^ user.cpp:116:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<g[i].size();j++) { ^ user.cpp:136:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<s[sol[i]].size()-y;j++) printf("%c",s[sol[i]][j]); ^ user.cpp:49:32: 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:50:34: 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); ^ user.cpp:52:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:54:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",ss); s[i]=ss; s[i].insert(0," "); ^