Compilare: user.cpp: In function ‘void solve()’: user.cpp:61:30: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] for(i=1;i<=m;i++){if(S[X[i]]&&T[Y[i]]||S[Y[i]]&&T[X[i]]){A[++A[0]]=i;}} ^ user.cpp: In function ‘void read()’: user.cpp:11:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.in","r",stdin); ^ user.cpp:12:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:14:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",X+i,Y+i,&c); ^ user.cpp: In function ‘void write()’: user.cpp:63:53: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] void write(){int i;freopen("critice.out","w",stdout);printf("%d\n",A[0]);for(i=1;i<=A[0];i++){printf("%d\n",A[i]);}} ^