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问题描述
如题所示
#include <iostream> using namespace std; vector<vector<int>> matrix(n, std::vector<int>(n)); for ( size_t i = 0; i < n; ++i ) { matrix[i][i] = 1; } -
解决方案
for循环在函数体外
#include <iostream> using namespace std; vector<vector<int>> matrix(n, std::vector<int>(n)); int main(){ for ( size_t i = 0; i < n; ++i ) { matrix[i][i] = 1; } } -
References
（20200714已解决）error: expected unqualified-id before ‘for’
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