Compilare: main.cpp: In function 'int main()': main.cpp:93:37: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] sum += dp[k & 1 ^ 1][l][i + 1][j]; ~~^~~ main.cpp:97:37: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] sum += dp[k & 1 ^ 1][l][i][j]; ~~^~~ main.cpp: In function 'char read_char()': main.cpp:24:54: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, sizeof(char), BUFFER_SIZE, fin); ^