Compilare: main.cpp: In function 'bool bfs()': main.cpp:66:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[u].size(); i++) { ~^~~~~~~~~~~~ main.cpp: In function 'int dfs(int, int)': main.cpp:80:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(; ptr[u] < g[u].size(); ptr[u]++) { ~~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'bool memo(int, int)': main.cpp:123:31: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(cnt == 0) return dp[x][y] = 1; ~~~~~~~~~^~~ main.cpp:140:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] return dp[x][y] = (res == cnt); ~~~~~~~~~^~~~~~~~~~~~~~