Compilare: main.cpp: In function 'bool bfs()': main.cpp:63:17: 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:77:15: 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:151:31: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(cnt == 0) return dp[x][y] = 1; ~~~~~~~~~^~~ main.cpp:167:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses] return dp[x][y] = (res == cnt); ~~~~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:171:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sakura.in", "r", stdin); ^ main.cpp:172:36: 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:175:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tc); ^ main.cpp:177:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:183:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp:187:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ main.cpp:193:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^