Compilare: main.cpp: In function 'void df(int)': main.cpp:60:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:100:39: warning: unused variable 'j' [-Wunused-variable] int i, y, sol, z, x, x1, x2, y1, y2, j; ^ main.cpp:97:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pirati.in","r",stdin); ^ main.cpp:98:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pirati.out","w",stdout); ^ main.cpp:99:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d\n",&n, &m, &p); ^ main.cpp:102:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",s[i]); ^ main.cpp:123:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&x1, &y1, &x2, &y2); ^ main.cpp: In function 'int lca(int, int)': main.cpp:92:9: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized] return r; ^