Compilare: main.cpp: In function 'bool find(int, int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int, int, int)': main.cpp:32:9: warning: unused variable 'i' [-Wunused-variable] int i,x1,y1; ^ main.cpp: In function 'void dfs2(int, int, int, int)': main.cpp:47:9: warning: unused variable 'i' [-Wunused-variable] int i,x1,y1; ^ main.cpp: In function 'void getarb(int, int)': main.cpp:73:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[x].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int lca(int, int)': main.cpp:90:11: warning: unused variable 'j' [-Wunused-variable] int i,j,dif; ^ main.cpp: In function 'int main()': main.cpp:128:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d%d\n",&n,&m,&questions); ^ main.cpp:135:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%c",&c); ^ main.cpp:139:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"\n"); ^ main.cpp:166:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d%d%d",&x1,&y1,&x2,&y2); ^