Compilare: main.cpp: In function 'void solve()': main.cpp:33:63: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(d[i][k] = d[k][j] < d[i][j] || d[i][j] == 0) { ^ main.cpp: In function 'void read()': main.cpp:6:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.in", "r", stdin); ^ main.cpp:7:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out", "w", stdout); ^ main.cpp:8:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &N); ^ main.cpp:11:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &d[i][j]); ^