Compilare: main.cpp: In function 'bool bfs()': main.cpp:84:17: 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:98:15: 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:142:31: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(cnt == 0) return dp[x][y] = 1; ~~~~~~~~~^~~ main.cpp:156:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] return dp[x][y] = (res == cnt); ~~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:161:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sakura.out", "w", stdout); ^ main.cpp: In function 'int getint()': main.cpp:12:48: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(++_ptr>=maxb) fread(buf,maxb,1,fin),_ptr=0; ^ main.cpp:15:48: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(++_ptr>=maxb) fread(buf,maxb,1,fin),_ptr=0; ^