Compilare: user.cpp: In function ‘void findpath(int, int)’: user.cpp:46:29: warning: unused variable ‘l’ [-Wunused-variable] int y=path[x][mask],l=dif[x][y]; ^ user.cpp: In function ‘int main()’: user.cpp:67:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l=2;l<=s[j].size()-1;l++) { ^ user.cpp:74:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l=1;l<=s[i].size()-1;l++) { ^ user.cpp:77:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==s[j].size()-1) { ok=true; break; } ^ user.cpp:89:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l=2;l<=s[j].size()-1;l++) { ^ user.cpp:96:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l=1;l<=s[i].size()-1;l++) { ^ user.cpp:99:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==s[j].size()-1) k=urm[k]; ^ user.cpp:117:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[startp].size();i++) { ^ user.cpp:132:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<s[sol[i]].size()-l;j++) printf("%c",s[sol[i]][j]); ^ user.cpp:54:32: 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:55:34: 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:57:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&n); ^ user.cpp:59:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(ss); s[i]=ss; s[i].insert(0," "); ^ /tmp/ccQ3VUKT.o: In function `main': user.cpp:(.text.startup+0x81): warning: the `gets' function is dangerous and should not be used.